It's out.
Prepare For War - Chaos and Pain

Very good, highly recommended for those that compete with a 24h weigh in.
2h weigh in, not so much but there is still some good info.

I compete with a pretty much 50/50 split of 24 hour and same day weigh ins, and have a meet on the 1st February with a same day weigh in. I'll type up my prep for you afterwards to give you all a good idea on how to apply the information contained in this book to a same day weigh in- provided I don't make a complete ass of myself