Yeah it has happened for my site. I had 35 links now I have 115 backlinks! I guess my work is working! I hope I get some higher spots in google now and a better PR when they update it.
Something is going on with PR. my site www.searchbliss.com is a 6 but if you check the pr without the www is had been a 2 since the last update (for some strange reason) but now it is also a 6.