Hi !
I'm also trying to do somehing like that (like the rss readers do) and it's hard to have a fast scroll, with caching images etc. I also found a tip : have a custom cell view et put a view into it instead of managing directly in your custom cell, right here :
Fast Scrolling in Tweetie with UITableView
(And Apple update the code for custom cell)
Have you any tips to give for caching, or improving performance ? thanks