I've tried to compile and install the mesa vbo_0_1_branch that should support
vbo and other cool features for my r300 ATi card, btw after installing the new
data and restarting X I got some problems: first of all it rebooted while kdm
was trying to load Beryl; then loading a basic (with no composite managers) X
session, I've tried to run firstly glxinfo (which seemed to be ok), then running
glxgears I got therse errors:

libGL warning: 3D driver claims to not support visual 0x4b
*********************************WARN_ONCE*********************************
File radeon_vtxfmt_a.c function r300MapBuffer line 576
Unknown access type
***************************************************************************
glxgears: vbo/vbo_save_api.c:204: map_vertex_store: Assertion
`vertex_store->buffer' failed.

The mesa dev list talked about this problem maybe, btw there have been no fixes:
http://sourceforge.net/mailarchive/message.php?msg_id=37414813

Please, someone could continue this work?! :)

THANKS!