The "next generation" of technology?

What would you do if you could time travel?  Would you want to meet famous people (or even your own ancestors)?  Would you try and influence major historical events, like assasinating Hitler before he came to power?  Or would you be a selfish, greedy opportunist who takes advantage of modern technology for your own personal gain?

One artist imagined what he'd do with a time travel device, and I think it's pretty ingenious. 

Imagine how popular you'd be at parties with an ALT1977 Pocket Hi-Fi:

Or how jealous all the neighborhood kids would be if your parents got you a Microcade 3000 for your birthday?  That snotty rich kid with his brand-new Atari 2600 would keel over in a dead faint if he saw it!

 This is some serious fun!  What sort of technology or ideas would you take back in time?  When would you take it to?  Would you be someone who wants to "save the world", or would you try and make some fast money?