What's the best way to make your bike more useful? Easy. Add a basket. You'll never look back. Wald, a Kentucky-based bike company has been making this $US20 basket since 1929, and slapping it on your cycle will be groundbreaking for your mobility
I'm speaking from experience -- I recently added a basket to my old Trek and it has made my life so much easier. Now I'm riding it so much more because I actually have room to cart my crap around. With the Wald, you'll have to buy a mount as well, but it's worth it. Having the extra storage space is like the difference between hauling things around in the bed of a pickup truck and squeezing your crap into the passenger seat of a tiny two-door.