Last week I attended An Event Apart, Boston (http://aneventapart.com/). It was excellent.
For any that weren't able to attend this year, you can read A Feed Apart (http://afeedapart.com/). It's an unofficial feed aggregator of the twitter posts of attendees while the event was in progress. There are also photos posted on Flickr (http://www.flickr.com/groups/aeaboston09/).
If you haven't heard of An Event Apart, I would highly recommend it. It's the best conference I've been to.
You can also check out A List Apart (http://www.alistapart.com).