Neglected to mention this earlier, so just in case the blog police pick me up on it later and withhold my winnings, I have added various RSS feeds to my iGoogle tabs, including the  23 Things one. RSS feeds are simple to add and the danger is adding too many to any one page, as too much scrolling can make the bottom of an iGoogle page a pretty lonely place. In my case more tabs and shorter pages are more effective and are pretty quick to scan on a daily basis.