I tried LibraryThing and for me it is VERY simple. I'm not used to wandering around these type of sites so the simpler the BETTER for me. I look forward to spending more time learning this site -would love to get ideas for new books to read from others. On a postive note I saw an article and it talked about "aggregators" and I actually knew what they meant! Just knowing what a wiki is is a huge event for me! When I get a chance I am going to try Shelfari as well.