Are you using ZiPhone? If you are not, you should be.
If you are, are you using 2.6b? If you are not, you should be.
If you are, have you tried the crazy-spastic repeated tapping of the jailbreak button?
And what size Touch do you have? My 8GB went through without a hitch on 2.5.
Also, check
www.ziphone.org for updates and hints.... its his blog.