I missed this original posting on Janet Reid's blog - and maybe you did too...
She also did a post listing FAQs here:
Basically, she says if you send your query between 7pm and 8pm on Saturday night (New York time) she will send you a personal response with her thoughts. Don't forget to put "Chum Bucket" in your subject line... so be prepared if her response sounds a little like her Query Shark alter-ego...
She also says this offer is good through the end of August, which means there are 3 more Saturdays this offer will be valid.
You have to have a finished manuscript, ready to go out the door if she requests it.
Are you ready? Polish that query. You have 3 days to hit the next Saturday time slot.