Warning you are running out of disk space

[Shishir G]

Sorry if there are threads about this already i wasn't able to find them, if there are please link me!
The problem is yesterday i got a error message saying "Warning you are running out of disk space" i checked my settings it said i had 5.4GB left, then i went on the internet to research and figured that i was running low on the 300MB for system files, i went on cydia looked at the manage and storage and the system pie graph it said i had about 10% left which is bad out of 300MB.
It also said on some website that something called "bosstool" would help to move the files from 300MB to my 5.4GB but when i try to get bosstool it says "Depends iPhone firmware < 3.0" and won't let me install it.
Some people did this through SSHing but i really don't know how
and was wondering if someone could give me step-by-step instructions.
I have a iPod Touch 2G running 4.0 jailbroken

ANY help would be appreciated please!

???????

[Traavis]

Get SBSettings, go to it, then on the bottom left, what does storage say?