I spent my morning putting the finishing touches on the LB 'Splinter Cell: Double Agent' (Xbox 360 and PC) Walkthrough and Strategy (have I mentioned yet that it's the only complete step-by-step 100% stealth guide available?). From there I added some screenshots, and I now have a beautiful downloadable PDF version of the guide available for you here:
LB 'Splinter Cell: Double Agent' Walkthrough w/ Screenshots.

Please note, this version of the guide is for the X360 and PC versions of the game. I am now working on a guide for the Xbox and PS2 versions. A Splinter Cell's work is never done...