How can I synchronize my two Mac Computers?

If you are just looking to sync your files and document, give dropbox a try.

I use a similar setup (imac & macbook air)

my experienced recommendation is to use

• mobile me or icloud to sync email, contacts, calendars, bookmarks, etc… (google could be a substitute)

• dropbox for files, documents, pictures & some application preferences (textexpander)

• notational velocity with simplenote sync for notes

• *if something was still missing can access the imac from parallels desktop via the iphone app (or any other remote desktop application)

Depending on your usage scenarios (which you don't specify), I use the built-in rsync command to perform a one-way sync of files from one machine to another connected to the same network.

Alternatively, if you want full two-way synchronization (that is, sync changes made on either computer) then Unison (free/donationware) also works well.