Just a note to let folks know that I recently switched from having my sync server be my MacBook Pro to using WebDAV via swissdisk. It was extremely easy.
After creating my free account at
http://www.swissdisk.com, I simply set my Mac to sync to:
https://disk.swissdisk.com/user_name/
and my iPhone to sync to use "Advanced(WebDAV)" and the "location" to the same URL.
Poof. I no longer have to worry about creating a network on my Mac so that I can sync my iPhone to its server via WiFi.
To avoid my iPhone going right into sync-ing and slowing me down, I turned off its auto-sync. I simply do it manually when it is convenient for me. When I am near WiFi somewhere, the sync is fast, and when I'm not my 3G sync varies in time, but is never intolerable.
Life is good. Benefits, with no costs.