Hi - yes, ringtones are easy to add, change and manage, but txt tones not so much. There were some new txt tones added recently for the iPhone 4, but not many people are happy with them. For the ability to add tones outside Apple's supplied tones (plus a heap of other customisation) you could jailbreak your device.
clicknz: Hi - yes, ringtones are easy to add, change and manage...
Fwiw, everytime I do a sync with desktop iTunes I lose my custom ringtone from my phone completely, then have to add it back. Annoying to say the least.
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