Yeah, Miles, I used it on my network, not across two networks. Ditto worked fine on my network.
I like NetworkClipboard for the more file types that it will sync.
But I haven't tried that across networks.
Seems Dropbox would be good, it's pretty fast in transfering files of any type, and 2gb free would serve well. Limited to two computers if I recall correctly. For the free version....
Then email and IM's, I would recomend Skype, resource usage is lower then the other IMs I believe.
A few others that are different.
http://www.makeuseof.com/dir/luminotes-personal-online-notebook/
http://www.downloadsquad.com/2009/03/11/use-piconote-for-dead-simple-note-taking-anywhere/