There's not a ton of content, but the Medical College of Georgia student does update it a lot. He is on Day 33 of PA school.
Link
There are four more student blogs out there that I've found. I can't post them all here because I think I'm being blocked as spam, but I've done a mini-rounds on my site, and you can find it here:
http://psychosomaticpa.wordpress.com/2009/03/08/pa-student-blogs-mini-rounds/
I'm curious - does the advance site (or any that you know of) maintain a listing of PA and PA Student sites?
Another great blog from a PA student here:
http://dailymeds.wordpress.com
There are two great, new PA discussion forums as well. www.westpa-s.com and www.nwpa-s.com. Good resources for Pre-PAs and current students.