Hi. I've compiled a somewhat recent version of cinelerra for ppc (with altivec, no opengl), and I've just successfully updated to 7.04. Opengl is out of the question because only proprietary drivers provide version 2.1 instructions (though the newest version of mesa should fix this).
Would you like me to give you the package for hosting? I would need some instructions, since I've only used checkinstall so far (which I realize doesn't make a proper debian package). I can also go for the most recent svn if you like (mine package is from about a month ago I think).
There are some ppc issues, most notably the uselessness of libdv on ppc (makes any dv show up pink and green), but it's fine for other stuff (like hdv, if your proc can handle it). Anyway, let me know if I can help.