Have a PDA which has 5 minute medical consult, epocrates, & a pocket DSM. That pretty much set me up for most of what I had to know in terms of quick reference.
Any cheat sheets, put it into your PDA so you don't have to carry too many notes & books on you.
There is a PDA DSM out there but I had it. I thought it blew. Its not organized in a quick manner where you can get what you want quickly.