First of all, prepare to be surprised as you unpack this file, the .vtf format is lossless, meaning every animated frame is uncompressed. While this archive is under one meg of data, the .vtf format stores each frame uncompressed at around one megabyte. The animated skin has about 60 frames, so you end up with a 65meg file. Bear in mind textures get loaded into memory, so it might increase your load time by a few seconds or so. I haven't really noticed any difference.
This is just something I thought up of doing one afternoon, after seeing modul3's skin, didn't take me too long to make. Originally I made them for personal use, but after a few people requested I put it up for grabs, I decided to upload it anyway.
The RED saughter has the pulse meter on one side, but since the texture is shared on another face, it will show up on other players on the other side as well.
All models show up in world view, since the skins are shared.
18/06/08 - Fixed a somewhat noticeable alpha layer mistake.
INSTALLATION : Just extract it to your \team fortress 2\tf directory, it should find it's way to the correct directory. If not, the two c_leechgun files should be in \team fortress 2\tf\materials\models\weapons\c_items.