Woohoo! Twitter support is here. You should be able to enter mileage information directly via twitter now! Just add your twitter username to mymiler.com, and follow http://twitter.com/mymiler. It will automatically follow you, and from there on, direct messages to mymiler will create entries for you.
Currently valid entries are things like:
100000m 20.00g $3.289
100000m 20.00g 3.289
100000 20.00g $3.289
and more. Anything that doesn’t get processed is still captured, so that it can be reviewed at a later date.