Seattle-based company Three by Three makes Magnetic Strip Bulletin Boards that are just about perfect. They're practical because they get some of those important invitations and reminders off that pile on your desk so that you won't forget about them. They're perfectly shaped to fit just about anywhere. And they're available in 13 colors to make your home office really pop.
Magnetic Strip Bulletin Boards are sold at retailers such as Velocity Art & Design and fridgedoor.com for about $12. Twelve small magnets are included.
They also sell a steal version of this at ikea for about $3
Actually, the one at IKEA is only 0.99:
http://tinyurl.com/evb9p
The 12-pack of round magnets is $2.99. BIG magnets, not dot sized magnets.
IKEA: 22"x2"
other one: 28"x2.5"
I like that it says that the magnetic bulletin board doesn't leave tack holes. Nope, but any of these things need to be mounted somehow. Like with screws.