Yes you can. If you are also going to add music and some apps to your iphone, you'll need to authorize the 2nd computer as well. When you sync to another computer, it'll erase the music in your ipod and replace it with the one you have in you 2nd pc. Other than that, it'll sync all of your contacts and even notes if you have 3.0.
I'm just looking to use the 2nd computer for syncing contacts, maybe calender too. can i avoid it erasing my media on my phone?
Some helpful hints: 1) Disable auto sync on both computers 2) Enable manual control of music and video 3) Take a look at these instructions on how to make your iPod think both computers are the same library so you don't constantly lose content on your iPod
If i just disable autosync on both computers and only sync media on one computer but allow sync of contacts/calendars on both computers will that keep all the contacts/calanders in sync with eachother?