Here are all the listed Gamecube revision and their IPL versions:
IPL Version 1.0 : This IPL can be found in both PAL and can NTSC Gamecubes however for PAL gamecubes it's the only one IPL revision available, and the NTSC and PAL version of this IPL are different. It can only be found in DOL-001 REV A gamecubes
IPL Version 1.1 : This IPL is used on REV A/B NTSC dol-001 gamecubes but it can also be found on PAL M DOL-002 Brazilian Gamecubes and uses the same version number ! (I heared 1.2 could be found in those too but I have no real proof yet)
IPL Version 1.2 : There are two version of this IPL, they are all for NTSC units. One is for DOL-001 and the other is for DOL-101 both versions do have the same version number but not the same release date and are not compatible each others, thats one of the reason of the numerous bugs from Cobra 0.2 ; 0.3 and 0.4 with DOL-101 units. this IPL can be found on DOL-101 REV C and DOL-001 REV A, B Gamecubes.
IPL Version ?.? (1.1 and maybe 1.2) : This IPL is very special, it can only be found in DOL-002 gamecubes that are only beeing sold in brazil (allong with DOL-001)
it's a special gamecube co-produced by both Nintendo Corporation and Gradiente Corporation (A brasilian Company) the main differences are that the gamecube menues are in Portuguese (Official Language in Brasil) and that the display is in PAL M signals. beside that the gamecueb is the same but this very particular IPL makes it uncompatible with Cobra that do patch the GC IPL to work however it still works with anaconda, QOOB and of course GCOS.
REV A: DOL-001 gamecubes with both Digital AV output on and Serial port 2 inside ::Status: Still beeing sold in Europe and Korea (NTSC J) , Sold out in Japan and both North and South America.
REV B: DOL-001 gamecubes with both Digital AV output on, but where the serial Port 2 had been removed ::Status: Sold out worldwide but you can still get one in the usa if you exchange your DOL-101 (unmodded) gamecube to a DOL-001 version with nintendo (for free).
REV C: DOL-101 gamecubes without Digital AV output and serial Port 2. ::Status: It's the current Retail version for worldwide exept for PAL gamecube systems (EU + Australia) and Brasil.
*I still don't know if DOL-002 brasilian gamecubes are REV A, B or C.
I know it can help or interest some people to have that IPL version guide and know more about those, however only Retail IPL versions are mentionned here, don't look for details on the TDEV or NPDP GBOX IPLs while looking at that post !!
Thanks again for the time you spent reading those lines
NOTE about Panasonic Q: There is also a modified gamecube that reads dvd videos that is called the Panasonic Q and that is only beeing sold in japan, however I don't know what IPL version it can have, I heared someone has a V2 IPL in his Panasonic Q, however panasonic Q, is just composed of a panasonic dvd player mainboard, a gamecube mainboard (a japanese DOL-001 Retail version) and a (VERY) mofidied v8 Drive (that only has v8 in the drive version but that is totally different from standard v8 drives) it also uses two different drive controler chips, one for dvd and the other for gamecube, and the gamecube controller will NEVER allow to read more than 8cm medias (no full dvd reading on the gamecube mode as it's hardware limited by the controler chip) howver Q can be much less picky with medias than standard gamcubes however current Panasonic Q drives aren't supported by Cobra and GCOS yet, you will need a QOOB to run backups on that unit.
*UPDATED 29/04/05* I've been using IPL version numbers given in cobra to make this review easier to understand but in order to remove some missunderstanding I'll be using the official ones staring from now, there also apears to be 2 others NTSC IPL revisions but I don't know enough about them to post those on that review yet so I removed those from it (for now) and yes I checked a descrypted NTSC 1.0 IPL, it appears to exist however it doesn't have any version infos in it (that's not the case of other IPLs) so I didn't know it was the NTSC 1.0 until DrMatrix post, in fact it was mentionned as IPL 0.0 in my last review.
I will continue to update that review as soon as I get more infos