All under the sun ( :-)

Looks like Hauppauge is one card, that has good Linux support.

PVR-500- Two Analog Tuners, two MPEG encoders
http://www.hauppauge.com/images/pvr500_b.jpg

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HVR-2200 - Either Dual Analog or Dual DVB-T - It is considered to be the successor of PVR-500
Review1
Review2
Installation and stuff
http://oss.casalogic.dk/doku.php/hal10k:hvr2200
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Maybe good site to search
http://www.newmagic.com.au/