Thanks for the tip - that's another one I'm looking hard at, as well as Dynamic Weather. I want to see some rain and snow every now and then, damnit.
Other mods that I'm looking to get (besides the basics like FOMM, FOSE, Invalidate Validate (?), etc.) include Feng Shui, something to replace the night sky (I'm a bit of an astronomy nut), replacement body models, Megaton/Tenpenny house mods, and definitely something to expand the dreadful choice of character hairstyles available in the vanilla game.
And naturally, I'll be trying the biggies like FWE and MMM at some point.
I'm sure I'll find others I want to use. I've barely scratched the surface of what's available at The Nexus.
I would have tried the weather mods, but I don't like the fact that it rains everywhere in the outside world. Meaning, even though there's a roof over your head, as long as you're outside you're getting rained on. It's a total immersion breaker for me
You don't need Archive Invalidation Invalidated or whatever it's called if you install FOMM, as FOMM has the tool already. If you want to replace the night sky, I suggest downloading http://www.fallout3nexus.com/downloads/file.php?id=6170 and extracting ONLY the sky textures to the Fallout 3 data folder to get your nights to look like http://i379.photobucket.com/albums/oo232/71boss351/fallout3/ScreenShot105.jpg, in conjunction with Fellout. There are several body replacers, as a forewarning most (probably all) require you to have an account set up on the Nexus if that's where you're looking. Otherwise, they won't show up when searching.
A little bit of advice, FWE and MMM are great mods, and go together like they were meant to, but FWE is best used when starting a new character.