Question regarding syncing to another computer

I currently have my iphone synched with my macbook. I want to sync it with my desktop since it has the same music currently on my macbook (and more). I have no problem with wiping the music from the iphone but I am afraid of losing my contacts as they don't exist anywhere else except on my iphone (the computer they migrated from died).

First, is there a way to transfer my contacts to my desktop?

Second, is there a way to resync my iphone with my desktop and keep my contacts in tact?