Capital Punishment - a comprehensive Fallout 3 and New Vegas all-in-one mod package with a focus on additional (balanced and lore-friendly) content, boosted performance / audio / visuals, expanded roleplaying options, and deeper and more polished survival elements - has been updated to 2.0 as of today.
Check it out here:
Basically, this mod package enables you to play through a combined and considerably expanded and polished Fallout 3 and New Vegas experience, with a single character. Your MC's story will lead them across the vast American wasteland over the course of several in-game years.
A program called Wabbajack is used to simplify the install process considerably by taking care of most (almost all, but not all) of the work for you. Check the install guide for more details. Essentially, you can have like 200+ carefully balanced, lore friendly, and preconfigured mods installed for you in like 2 hours or less if you follow the guide well. 2.0 apparently brings huge performance improvements over previous versions, and based on what I've seen from the modlist, this def seems like one of the best ways to play either of these two games (or both!) if you're even a little mod-savvy.
Me? I'm gonna install the FUCK out of this. This is probably gonna be my final Fallout 3
and New Vegas playthrough. Might as well go out with a bang!