Maintaining Two Computers?

I've been using my MBP for about five years and recently picked up an iMac for home use/heavy editing. I transferred my old data and settings over to the iMac with Migration Assistant.

How do I maintain my setup so both computers are the same at the end of the night? Not necessarily both computers entire HDD, but both Lightroom 3 catalogs. I want to have consistent LR3 catalogs with current edits, ratings, keywords, etc.

I've been doing some research on this topic but haven't found anything Mac specific yet.

From this thread:

Nortelbert wrote in post #6116586
Set up all your files on PC "A" and share the folder. Run Lightroom on PC "B" and point it to the files on "A" to get the files. This creates a local catalog on "B". You can then copy this catalog file to PC "A" again if you do edits on PC "B" and vice versa.

Also, more information from this site.

I'm not a Mac user, but I'd imagine there'd be a way to network the two computers together to make this possible. I'd save all my files that I want sync'ed on Computer A in the same folder, share this folder on Computer B, and make sure that both computers would share, edit, and export to this same folder.

It works well on my desktop + laptop for Windows 7.