Can anybody recommend some good lightroom tutorials (aside from the video ones found on the Adobe site)?

I've just worked my way through 2500 images from a weekend's worth shooting, sending about 130 off to a magazine, and I was completely fumbling my way through a lot of the settings and tweaks, going 'yeah, don't really know what that does, so I'll just move the slider over there'

So, any good tutorials out there?