Building a Video Editing Box?

RexDart asks: "I'm building a new AMD64/939 box and would like to build into the system: capabilities to capture video from analog and digital sources; edit; add text and overlays; and maybe do the occasional DVE. This is for home movies, wedding videos and occasional project for work. This will be a dual boot Linux (Red Hat or Ubuntu most likely) / WinXP system. Open source, free, software would be ideal (Audacity will definitely be installed), but commercial solutions are not out of the picture. I'd like to keep the media production on the Linux side of the system and reserve WinXP for gaming, but is Linux up to the task?"

"Given the above considerations, the questions:
1) What's a good recommendation for video capture hardware?
2) What's a good recommendation for software?

I don't expect a definitive answer, but would like to narrow the starting points of my research.

Thanks!"