No, we don't have a Blackberry app and no plans for one. You can use the browser on your Blackberry to access Fuelly Mobile. It was built with the iPhone in mind but it works on Blackberrys too. Here's more info.
You can grab a launcher app for BlackBerry at the link below. It's just a web link to take your BB browser to the Fuelly mobile site. It's got the cute Fuelly logo and it's one click and you are in. Pretty handy. I'm using it on BB Storm ... not sure if it works on other BB's.
Wow! The creator of the EDL launchers just messaged me and says he has corrected his URL on the BB launcher and it should be posted on his daily blog soon ... not sure if that means tomorrow or a few days or what ... apparently he has been swamped due to sudden exposure at crackberry.com. This should correct the issue with forcing a log in every time the laucher is used.
I use Fuelly's mobile access from my Nokia flip phone...without logging in each time. All I did was bookmark the page for my car rather than the login page. Could that just be a case of my phone being "dumb" enough for that to work? Might be worth trying on a smart phone.