Eh, sokay article for session variables. I like to create a static class that contains all my session variable access code. Variables are accessed via static properties of the class that are stored in the session under names stored in consts within the class. The properties call an internal method (one for gets and one for sets) that actually retrieve the variables. Also, I use HttpContext.Current to get the current session, checking it for null first to avoid null reference exceptions. It usually happens when the web server is shut down, which becomes annoying when debugging as the web site is shut down and restarted multiple times.

What's more fun is creating generic cache-backed methods to retrieve settings from web.config in a type safe manner....