Is there anything that will act as a widget that will show the number of mins/texts I've used in a day? It's not terribly useful, but it'd be cool to have.
Call Meter NG
Highly rated, never used it.
You may have to reset it every day to get daily usage data.
Obviously there is no way for it to differentiate between free m-m calls and calls that burn your minutes. Also, if you have the $10 texting plan or above, no way to differentiate between free texts and texts that count against your quota.