I agree - my school allowed a free trial download of the paid version of Epocrates. The other tools aren't very useful and I never use them at all.
Well, the OP already bought a Blackberry.
It was too complicated to get into (particularly on a pre-med forum), but since you asked....the value of the other programs that you can put on your PDA is questionable.
For starters, practically all other medically related software is not free, and can be kind of expensive. I also don't know how useful these programs actually are, since there are computers every 5 feet in most hospitals, and are available to help you look stuff up.
Other software that is free (such as DxSaurus) is not useful - I've never used it.
There are other free programs, such as the OB wheel, which SUCKS. I'd rather use a real OB wheel, but I've never been able to get my hands on one. The PDA program for that was lousy.
I also had a free MMSE program on my PDA, which was not useful, since you can find paper copies of the MMSE all over any psych floor.
So, basically, my point was - the OP has a blackberry, which will eventually be compatible with Epocrates. Any other programs, which are not blackberry compatible, are of questionable use. It's up to the OP to decide if she/he needs those programs or not. Since the OP is still a pre-med, and years away from the clinical years, trying to figure that out is going to be pretty difficult.