Bob- I mention several times in the "housing" section that bettas do not do well with lots of filtration, although it is necessary to have some type of light filtration in their tanks.
Blackrosedragon - Never heard of a betta living up to 5 years, 2-3 years seems to be the standard, although some might live longer with excellent care. Once a day feeding is fine, yes, most fish food companies recommend multiple feedings a day, for obvious reasons. A betta will be perfectly happy in a 1 gallon filtered, heated tank if it meets their needs, obviously a 2.5 is better if it also meets their needs, they aren't huge swimmers so really don't need a lot of swimming room.
Greendragon (what's with all the dragons?!) - That is a good point, I thought I made it pretty clear that tankmates depends on the betta and some aren't suitable for community settings at all, I will edit.
Thanks for the feedback everyone!