There is no reason to yell at us. You can upgrade to another P3. It just has to be in the same family as yours for socket 370. Not all socket 370 boards support the Tualitin core which was the last P3.
You could upgrade that P3, but definitely cannot upgrade to a P4. Different socket. If you look at www.froogle.com and type in pentium III processor you'll get some hits. But double check what board you have and make sure its supports. Best of luck, its hard to find that kind of info on a machine that old.
I would move to a very cheap Atom/Sargas core with an integrated GPU/2GB of ram for ~150$ overall. Would have many times any P3's performance.
For that matter, you could get a modern Pentium dual-core and motherboard with integrated graphics for $99, and have enough left over for 2GB of RAM (DDR2-800). That would also beat the dogshit out of anything a P3 could do.