I felt I posted screenshots on my main blog too much, so I decided to move them all here!
My personal blog is Astrail
I currently own the following games, and it's likely I'll be posting screenshots from them:
The Elder Scrolls: Morrowind, Oblivion and Skyrim.
Fallout 3, New Vegas
Saints Row The Third
All posts are thoroughly tagged with the game, and the DLC (If it is a DLC specific screenshot). If you don't want potential spoiler screenshots, I suggest following with Tumblr saviour installed.
All DLC is tagged by name, the exception being Skyrim's Dragonborn. I tag it as both "Dragonborn" and "Dragonborn DLC"
I don't do any post processing effects on my screenshots, except for occasionally using Photoshop's Photomerge feature, or making animated .gifs.