I spent about an hour killing time online at this site instead of blogging (yeah, that's right, I got a life) about Obama and other worthless shit.
It has a shitload of useful links for all shooters, not just handloaders. I spent a huge amount of time calculating trajectories, bullet drift, cost per round when handloading, all kinds of cool stuff.
For example, I found out that it cost me about 13 bucks for 50 rounds of 41 magnum when I handload compared to 70 bucks for a box of 50 store bought. Damn!
Check it out when you get a minute.