for those of you asking what the hype is all about. here's what we've got so far that's different in Flock:

1. replaces old-school bookmarks with one-click social bookmarking to Del.icio.us
2. tagging is there if you want to do two-click bookmarking and tag
3. a new bookmarks manager with an integrated rss reader
4. built in search engine that indexes every page you visit and has a Spotlight-style as-you-type UI
5. keeps a list of the sites you visit most frequently
6. multiple bookmarks toolbar (one for work, one for play etc.)
7. finds feeds, lets you view them
8. caches the feeds so you can read them on the train
9. aggregated RSS view for all of your bookmarks folders
10. integrated blog editor (support wordpress, movable type, blogger)
11. one click 'blog this' feature (it does the blockquotes, citations and all that stuff for you)
12. Flickr integration (drag and drop pix into blogs)
13. shelf: a web scrapbook that helps you organizae stuff you want to blog

and of course it's open source and cross platform.

details at http://www.flock.com/fiveways/togetstarted/13.php