There are postings for 1E games from time to time here, so people definitely are playing it. Here's a link to a game I found through the LFG search: Elrukan adventures. As far as easiest to learn D&D versions, I'd go with either the Basic set of BD&D (that you can later expand with the Expert set) or my favorite Swords and Wizardry, which is a cleaned up restatement or retro-clone of OD&D. Swords and Wizardry has a free "Core" version and a reasonably priced "Complete" version. You don't miss a whole lot with the Core rules as opposed to the Complete version - some of my players are quite happy with the free version in the Complete campaign I run. There's also quite a few versions of D&D out there, most of which have free retro-clones available if you poke around and look.