This dicography is mainly based on the "official" DM discography started by Robert Schmitz and currently maintained by Louis Van Dompsleaar. What I've done here is give every single, album, video, and 1991 box set release and created a page for them.

Each page has:

Release date (month and year)!
US and UK chart info (where available)!
Complete track listing!
Complete 12", CD, LP, and VHS release info (cassette, laserdisc info where availabe)!
Catalogue #'s!
Cover art (where available)!
Limited Edition info (where available)!
Compilation and Soundtrack info (where available)!
Promo release info and cover art (where available)!
Full navigation through all pages with the links on the bottom of each page!
(Coming soon: Cryptic etchings and coloured vinyl for each release)

Mute releases are uniformly catalogued using an alphanumeric combination of a simple word used to determine format and a one to three digit number based on order of release.

STUMM is a MUTE album release
MUTEL is a MUTE compilation (greatest hits) album release
MUTE is a MUTE single release (used for the first 5 Depeche single releases)
BONG is a Depeche Mode MUTE single release (used from Leave in Silence to the present)

Prefixes/Suffixes used on album/single releases (example):

L is a secondary release (L STUMM 106)
7 is a 7" single release (7 MUTE 13) (used for all 7" singles before Strangelove)
E is a 7" EP release (7 BONG 7E)
12 is a 12" single release (12 BONG 1)
C is a cassette single release (C BONG 11)
G is a gatefold 7" single release (G BONG 17)
CD is a CD single release (CD BONG 15)
L12 is a limited edition 12" single release (L12 BONG 13)
LCD is a limited edition CD single release (LCD BONG 20)
XL12 is a special limited edition 12" single release (XL12 BONG 18)
XLCD is a special limited edition CD single release (XLCD BONG 24)
P12 is a promotional 12" single release (P12 BONG 26)
PL12 is a secondary promotional 12" single release (PL12 BONG 23)
(not neccessarily any more limited than a P12)
RR12, RCD is a designated radio promotional release (any format)(RR BONG 10)
DJ, DT,PP12 DANCE, CLUB, SHOP, D, S, J, or any other prefix not listed above are promotional releases for any format.

From Louis Discography (he explains it better than I can!):

This discography essentially catalogues all releases with preference to the original (in most cases) UK pressing/release of the single, record, etc. It also list a number of releases by licencees.

In the few cases where two songs with the same name (or remix name) exist, a comment detailing the difference is included. On several occasions versions of songs have been included on releases under different names than when they were first released. In some of these cases, the original name is the default (and a comment is about it is included). In other cases the new name is used, with a comment that it is in fact an existing version.

Many non-UK releases are included, mostly because they are items of interest to collectors (either because they contain new or different versions, or a large collection of versions). Catalogue numbers for these releases are included, as well as for licencee releases that are identical to the original Mute release Note that in most cases the date listed will refer only to the UK 7", and not to all the 12" singles, CD singles, and releases in other countries. It is intended as an approximation only where these are concerned.

All releases in the UK are through Mute Records.
All North American releases are through Sire/Reprise Records (a division of WEA).
All German releases are through Intercord.
All Benelux releases, since a few years, through Indisc.
In the instances where releases are by other record companies, it is noted.

PROMOS AND COLOURED VINYL

What's a `promo'? The term stands for "promotional record" and refers to records given to DJs, radio stations, reviewers, etc. by the record companies so they can review them, or play them. Generally so the songs can get some publicity. Often these promos are released prior to the actual release of the single (by days, weeks or months). Most of them are simply the usual 12" singles (or CDs, or 7" singles) with stamps or stickers on them saying something like "For promotional use only, not for resale", but occasionally they are different in appearance from the usual releases, either by having a so-called "white label" (exactly that), a different catalogue number, or in the more collectable cases, a different sleeve or track list, and best of all, some different mixes or songs, not available on the general releases. Mute Records are infamous for the amount and variety of promos they distribute, but if you look closely you'll notice that only a very few have unreleased mixes on them. And of the mixes that are unreleased (officially), a lot of them are 'radio edits' which are nothing more than single versions that fade out at the end in a radio-friendly manner.

The other common release that is hardly mentioned is coloured vinyl. Many of Depeche Mode's releases have been available at various times and in various countries on coloured vinyl. The availability of these releases varies of course on where you live, but some are much rarer than others, especially coloured 7" singles. Amongst the most common coloured vinyl is anything released in Germany in the mid to late 80's, because at that time it seemed as if every Depeche Mode release came out on some sort of coloured vinyl. No attempt is being made to list all the coloured releases, or individual ones in order of rarity; and only specific, interesting releases (mostly the ones that have differing track listings as well), are included.