FSX Missions website.
So I'm off the rants and onto something more useful... a website that has a whole bunch of great stuff regarding missions in FSX. It's called FSXMission.com (imagine that) and has a whole bunch of downloadable missions as well as some how-to videos and other useful stuff. I knew that the mission feature was going to provide users with a bunch of really cool add-ons. As it is I love flying most of the default missions, but I'm sure that our creative 3rd parties are going to come up with some really amazing stuff.
On another 3rd party note, check out FSDeveloper.com as well. It's a great site about how to create various content for FSX (and FS2004). Its got a great forum if you're a developer for Flightsim.