Team Blogger are going to conduct several usability studies of 1 hour each between 17 and 24 June 2010, via phone and broadband computer connection. (Interestingly you have to have Windows 7, Vista, 2000 or XP for the session - not Mac or Linux, despite Google reportedly deciding to stop using Windows internally due to supposed security concerns!)
It seems from the sign-up form that you don't even have to be a current Blogger user. Needless to say, you don't have to live near Google's California offices.
If you'd like to help improve Blogger do fill in the form (for age 18 & up only), and if you get picked to take part they'll give you $75 in Amex gift checks for your trouble. Note that they'll be recording the sessions. More FAQs here. No guarantee they'll select everyone who signs up, of course - they aim to get a mix of people - but no harm signing up!