I used QuickPwn and after several tries, jailbroke my 2g Iphone running 2.1 firmware. I have done this before using ZiPhone, and PwnageTool and it worked fine. After using QuickPwn, turned on iPhone, showed both Cydia and Installer, installed one thing with Cydia, resprang, and Cydia is now gone. Any advice? Should I just repwn?

if i would be you i would first backup everythig and then restore back to default setting and then upgrade to a fresh 2.1 version using itunes and once thats done i would jailbreak using quickpwn. and then restore from backup.

P.S. make sure u UN-Install the quickpwn previous version from your phone and reinstall a fresh version. you can find everything you need from iclarified.com

hope i can help.

Use pwnage tools i feel its a better process
also u can install open ssh from installer and try changing cydia permissions or u use quick pwn again to try and install cydia