JS_Harris - 3:06 pm on Mar 2, 2010 (gmt 0)
The most dangerous time will be when he's into the sites code and the money isn't yet released. If he/she is after something particular to your site (ie:list of member email addresses, code to some specific feature etc) this is when you'll find out.
Since you're meeting in person draft an "intent to sell/buy" agreement and clearly state that until money is released the sale is NOT final and that NO code/information is deemed to have changed hands. Make clear that it is still yours 100% until the funds are released. I know this is redundant but a poor judge hearing your case later needs to have something concrete with which to make a decision. Not all judges are net friendly.
Your brain needs lubrication
Got a chuckle out of that, thanks artefaqs.
I once sold a site (small site for an insignificant amount) and accidentally deleted the database the morning I was to transfer it. A backup saved my bacon. Great learning experience.