Here are a few sites I've come across recently and have taken many return trips back to as well. Let me know if you are a fan of any of these or if you find them useful.
This one is great in many ways for many different people. Whether you need cheap marketing for your business or have a personal task you need done, heck even if you want a funny, unusual gift this place has those options and more. Fiverr lets you hire people to complete tasks for $5 - fast and convenient, I'll definitely be back here.
With blogs, articles, and videos from the world's top thinkers this site definitely gets you thinking (outside the box). If you're looking for some real, substantial knowledge in this world of lackluster, over-hyped gossip then Big Think works. Big Think could also be great for teachers in the classroom, I could see many projects developing based on some of these article topics.
With a bombardment of travel sites to choose from, Hipmunk keeps things simple. Flight searches with an easily understood layout - enough said.
Summer Tomato is a blog with a unique perspective of food and health, from a science standpoint. Loaded with tips, tricks, recipes, and explanations behind it all - if you're looking for better ways to meet your New Year's resolutions check out this blog.
Also be sure to check out my new mazes, including a 2012 Calendar.
Mazes of the Century - personalized, mind-boggling mazes