AVerMedia AVerTV DVB-T 771 (A771)
I have this card working fine, under 2.6.13-rc7. I applied the dvb-kernel patches from CVS. These are the kernel modules I compiled: all options under "I2C", all options under "Video for Linux" (incl. "DVB", obviously).
To get the card to work simply call "modprobe dvb_bt8xx". Then run, "scan" (from dvb apps) or MythTV as normal.
I have this card working together with a Hauppauge Nova-T (the "new" Conexant version).
There's a nice HOWTO for this card on the avermedia website: http://www.averm.co.uk/avermedia/docs/pdf/linux.txt