There are so many things I love about the Apple and the Mac platform. However, the whole dotMac/Mobileme thing has been a resounding disappointment. Besides being sluggish, the whole interface is, well, clunky and blah. I also think iWeb, and the way it works with Mobileme sucks terribly. Why am I still using it, you might ask? Just one thing, actually: backups. Ok, that and coveting an iPhone.
Seriously, though, with the exception of the automated backups (and the integration with such programs as Quicken), all the other pieces are better done by others; much better done. Picasa and Flikr do better with photo sharing. Blogger and Wordpress are much better at person websites/blogging. The Mobileme calendar is quite lame.
In many respects, I think I should simply stick with Google for most of my online needs. Picasa, Blogger, etc; though I still love my Macs. I'm sure that I'll be swayed to check out the next offerings they have. I deeply hope they keep working.