So I've been playing Dragon Quest VIII for the PS2 lately. I came to an interesting problem where I have this alchemy pot, and a bunch of items, and a list of formulae (stolen from a Web site), but no easy way to correlate them. So rather than spending 5 minutes to put it together manually, I did what any good geek would do and spent an hour writing a program to calculate for you!
Basically, you check off which items you have, hit "Go", and it'll tell you what you can make. Fairly simple, but also pretty useful, in my opinion. It also uses cookies to remember which items you used previously, so you can come back to the site later and it'll still know which items you have.
Here's the link:
http://www.skullsecurity.org/DQVIII/If you can break it (or if you want the source), let me know!