Not since 2.0 came out. And even prior to that, I didn't keep my phone jailbroken for long. The hacker part of me liked it, but I just didn't have much practical use for anything it offered.

The one thing that would tempt me is the ability to tether in an emergency, but I managed to snag NetShare to fill that need. 3.0 on a 3GS still hasn't killed NetShare.