Good Information To Have: a video from Red Light Chicago about what exactly happens if you get arrested on a misdemeanor prostitution charge. It's helpful in terms of planning what-if scenarios, and gives specific little details worth knowing. For example, because it's a collect call, you can't call a cell phone from jail, you can only call a land-line. So whoever you'd want to call in such an emergency, you need to have a land-line phone number memorized for them.
It's Part Two in the Know Your Rights series, but the whole site is worth checking out. I think these women are way cool!
For further information about your legal rights - everyone's rights, not just sex workers - in the event of an arrest, read this: Beat The Heat: How To Handle Encounters With Law Enforcement. This book is done in sort of a comic-book style, so it's VERY easy to understand, no legal education required. It's just the basics, this is no substitute for a real attorney. And I hope none of us ever need it, but hey, knowledge is power, so empower yourself.