I almost missed it too, but on Friday, September 14th, 2007 the original Microlite20 thread gets listed as one of the highest replied-to threads over on the forums, with 1,149 replies. Which is nice.
M20 has a lot of cool mechanics in a tiny space, including simplified level advancement/XP, spell-casting and (my personal favourite) the skill system. It’s worth checking out if you want a system where it’s possible to hold all the rules in your head, or a system which plays fast but is also usable with published d20 adventures.
At some point, I’m going to revisit Microlite20 and see if there’s any more polishing to be done. But not yet