Hi,
If you'd have any interest in a crude, half-baked XOOPS 2.0.9 + random modules .chm documentation made using doxygen, download the following files:
http://www.zoo.bio.br/xoops.chm (17,6MB)
http://www.zoo.bio.br/xoops.chi (1,5MB)

Bumpty-boo
Using neato now:

Hi Ajax

Really is very good

Thanks Giba (manda a lista ou te dou as dicas, o que o freguês preferir)

Now I've suceeded (and it as a PITA) to generate a PHPDoc version, much like that XOOPS API link over there, but using 2.0.9 (as opposed to 2.0.6) and the same random modules as above (and forgeting to request a nice output format, sigh)
Click this link to visit a Crude XOOPS 2.0.9 PHPDoc API.

So, if anyone is interested in discussing what output format(s), modules, hacks, etc., would be interesting for a more serious API documentation, I'd be glad to try to produce it (them?).

If you want the whole thing, here's a 3MB zip containing the PHPDoc stuff.

Edit: Previous .chm and .chi files taken offline, try these if you want to sample that format: http://www.zoo.bio.br/xoops209.chi
http://www.zoo.bio.br/xoops209.chm

And this is the same version but uncompressed, in Brazilian Portuguese: http://www.zoo.bio.br/xbr/