I check my credit card and checking/debit card accounts on at least a daily basis. The checking account is usually checked at least twice a day. There have been a number of times where I have been able to catch charges or deposits that weren't correct and get them fixed quickly.
If I'm away from the internet for more than a few days, my fingers get really itchy for want of being able to check my financial accounts. Oh yeah - I also check my 403b account 2 or 3 times a month.
All online of course.
Laura