New posts each day also. You can include (in RSS 1.X or 2) the full text and link of the post. RSS has changed alot since its early days. Really elegant now, and in beta versions of certain Microsoft software, pretty cool stuff.
Check out the RSS feeds on www.xda-developer.com - that will give you an idea of forum posts showing up in RSS feeds (they give the last 30 new posts I believe)
I use this one, it's nice because it integrates into MS Outlook for those of you who use that. Also, Check out www.rssfeeds.com for a good listing of RSS feeds.