Author P.N. Elrod is holding a virtual garage sale to raise funds to pay for her pup Fuzzy's vet bills, and among the treasures are donation critiques:
Limit is 2500 words. If it goes longer to finish out a paragraph, that's okay, but don't send more than that. Most editors and agents make a decision based on the first couple pages. 2.5K words = 10 manuscript pages. Send the start of the story or novel, no prologues, no middle of the story with your "best" stuff.
The author asks for a donation (minimum $10.00) in return for the critique, which is quite reasonable. I also have it on good authority that a very cool bag of convention swag will be added to the Garage Sale page in the near future, so check back for updates.