The philips chip looks intresting, but the big problem is finding something which uses it and is current. I tried looking for some of the cards above, but many either seem to be no better than the old bt8x8 cards, have lots of problems or aren't even sold any more. That seemed to be a regularly occuring problem while I was searching for a capture card for linux -- finding a capture card which could still be bought(!) and which works ok.
For example, the recommended cards for use with programs such as the mjpegtools (just as an example) - the pinnacle dc10, dc10+, dc30 and Iomega buz are all dead cards which are no longer sold at all; the zoran chipset which my G400TV uses dosen't seem to be being used on very many cards. I could only find 1 mention of a dc10 even on ebay, and turned up 0 results for the dc30. Many of the other names of other capture cards such as happauge, wintv, etc. - the model numbers listed as working under linux simply showed up at most shops that the card was no longer being made or sold.
Linux media labs had an intresting zoran-based card, but at approx. $400 plus another $85 (P&P as I'm in the UK) it seemed to be overpriced.
There are lots of USB based video capture devices now too, but I'd be concerned about the quality due to the slow nature of USB.
Prehaps I should get my old Amiga's Vidi Amiga 12 to work under linux