UPDATE: Why We're Not Telling Geek Squad CEO Which Agent Stole The Porn
If our techie readers were right about the Geek Squad doing this, then perhaps they're right in saying it happens at other computer repair places as well.
We advise encrypting sensitive files in advance with a program like TrueCrypt (WIN) or making an encrypted disk image (MAC, be sure to skip step 6). Or, keep it all on an external hard drive and/or zip all the files and password protect them.