For those who dont know, Path of Diablo or POD is like a private server for a modded version of D2. Run by and hosted by a group of people you would download and extension of the game and login to their server instead of BNet type deal.
They've modded things like bigger inventory / skills are different / and some gear aswell. Different style currency and keys/organs are also different. i have very little exp playing it but i have close friends who play it alot so i know of it and things about it by ear lol.
edit: also has a decent size community from what i hear