Ok folks. I want you knowledgable commuters out there to tell me what the best upgrades you'd make for my budget commuter. We're talking bang for the buck, pack for the punch. No frivolous expenditures, but pricey, effective ones are definitely welcome.
I'm riding a steel Gary Fisher Mamba with a rear rack and platform plastic pedals, and an "InSync" front suspension fork that I can't find the specs for anywhere on the web. I use panniers to commute. No special bike shoes yet. Shimano Alivio shifters, occasionally hiccup, especially on the high-speed gears, but overall solid. Mild rust on the cables, but brakes work great. Kickstand's on. No bike lights yet (not even a rear blinkie yet). Kryptonite U-lock (Kryptolock). Stock seat, nothing fancy. I wear coolmax type clothes (not biking specific clothes) when I commute.
I love the bike frame, but I think there may be some improvements I can make for a reasonable expenditure. With all the gas money I'm saving, I reason it's worth it to upgrade!