Perhaps the most unique movement in weapon mods these days is the "theme" mod. It started off with Immoral Conduct's focus on "real-world" weapons, continuing with wads like LowTech Weapons, Operation Mjolnir, and others. I've carried the idea further - nearly every weapon in this WAD file (barring your foot and Glock pistol) is energy-based. Blaster pistols, wave guns, and the Helix Cannon are only a few of the AA-powered flesh-sizzlers you'll come across here.
See bottom of text file for full list of sources
New from scratch
XWE, Adobe Audition 1.5, Paint Shop Pro 9, Editor^2, DragonUnpacker, GCFExplorer