This might be old news, but a very fun Excitebike inspired game was put up for download by DHG games. Seems when they completed coding it in early 2007, the publisher pulled out because they felt the GBA was dead by 2007.
So here it is. They are currently working on a DS update for sale in the future.
I intend to buy it gladly, as I support little devs like DHG with old school flair.
Here's the site. And download link.