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Not an app per se but SBSettings is a must. It lets you change brightness, sound, wifi, and SSH settings (and more) without ever leaving an app.
 
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What is the best app to jailbreak the iPod touch 4g?
 
Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7)

What is the best app to jailbreak the iPod touch 4g?

What computer/OS combo are you using?
 
If u don't already have it get winterboard it is necessary for getting themes off of cydia. If you don't have winterboard you can't use themes off of cydia. It is how you select themes
 
Folder enhancer is the BEST! It opens up folders much quicker than stock and then the built in folders in folders works great. Now I have nothing on my springboard.. just an apps folder with a bunch of folders inside that. clean screen!
 
The nyan cat in notification center cuz when you check something you hear "NA NA NA NANA"!

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