There is no reimbursement for a hotel, but you draw regular first year FO pay during training (70 hour min). I don't know about every other airline, but I know JB pays $2500/ month (last year's rate anyway) and Pinnacle doesn't pay anything during training.
To be fair, AirTran does pay for a hotel in training. What they do not pay for is a hotel while you are in your base, which is Atlanta for all pilots. If you do any training in a city other than ATL you will have hotel provided. As long as we only have one base they can get away with this.
When I was hired at AirTran, my class trained in Miami. We were provided a rental car, a townhouse, per diem, and a paid travel day each way between events (if you went over your guarantee, which we did).
When training is in ATL, however, you provide your own accommodations. Not a biggy in the scheme of things.
When I was in training back in the spring I paid $300 for two months in a crashpad that was only 5 min. from the training center. Hotels are nice to have but it's really not worth that much of a fuss. We don't provide it, big deal. The cockpit in the 717 makes up for it. P.S. I still haven't gotten around to changing the name.