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Did you see the edit to my post? The PB99 method works without a computer.
You needed S-Off to enable these fastboot options. You still need a computer to use it.
Duck when you rooted your phone I am sure you installed SDK files on your computer? Its commonly known as "android-sdk-windows" in case you forgotten it might be in the root of ur C: drive on ur computer....
If you have it... place the "cm7 img" in the "tools" section within the android-sdk-windows file and then use fastboot commands I give you yesterday to flash it:
http://androidforums.com/2946116-post84.html
Cheers everyone, I'm just getting confused that's all, I thought being s-off I didn't need to use the pc, I know I can use pb99 but that's seems more hassle, what is it then that being s-off enables me to do that s-on doesn't?

Flash a hboot. Flash a recovery. Change partition layout. Edit android system files whilst running
Stop being scared of pcs
Read my faq as you're not going to progress in the android world without fastboot knowledge.
..and adb
Not adb. Fastboot. They're both command line but different.