Ok so I'm looking for a good app for my ipod that includes guitar scales/modes in it so that way I can practice my scales without having to be sitting at my laptop to look them up. (plus I still have yet to find a book with pure guitar scales in it)

Anyone know of any good apps in the itunes store with scales?
I tried the Guitarist's reference lite app, it seemed cheap and the whole layout kind of annoyed me...mainly because I could only view a few frets at a time. I may just have to pay $10 for Guitar Toolkit, it looks like the most well-done app so far.
Guitar Toolkit is well worth the money, it's the best app I've found.
Gear List:
Yamaha SJ-180 Steel String Acoustic
2008 Ibanez S520
Peavey 6505+ 112 Combo
Peavey Vypyr 15W

Call me Erk.
+1 guitar toolkit.
Actually called Mark!

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