Shoutbox

Why more RAM is Better < That website sums up many of the key facts you will likely use (for home use that page doesn't really go into a lot of detail of advantages of RAM if you're running a server but it does cover it). However that is perfect for the key advantages of having more RAM.

Just make sure you get the RAM type that works with your motherboard (older computers can't use DDR but can use SDR).
Also its never a good idea to mix RAM types; ie. if your computer already has some DDR don't buy some SDR because its cheaper as it isn't as efficient and will lead the current DDR RAM to have to run slower which will cause problems.