I think (fingers crossed) I've just succeeded in doing two things I've really been hoping to be able to do with Dropbox: keep my Favorites and RSS feeds synced on both computers. Quick, before I forget how I did it:

On home computer:

Favorites:
-- moved Favorites into Dropbox folder (I used regedit, but could have used TweakUI also).
-- opened IE7 and saw no Favorites listed
-- googled around and found this was probably due to the Favorites folder having lost its system attribute. The fix for this is the following dos command:
ATTRIB -S C:\Documents and Settings\cubbie\My Documents\My Dropbox\Favorites /S /D
-- back to IE7 and Favorites list is back

Feeds:
-- didn't know how to move Feeds folder with regedit and it doesn't seem to be an option in TweakUI
-- went to Feeds folder location, right-clicked, dragged into Dropbox folder, selected Move Here option
-- opened IE7 and saw no Feeds listed
-- above system attribute command was not the fix
-- googled around and found I had to reimport Feeds into IE7. Noticed that when I moved Feeds folder to Dropbox, a file called feeds.opml had also been placed in Dropbox
-- in IE7, File > Import and Export ... > Import Feeds, selected the feeds.opml in the Dropbox folder
-- back to IE7 and Feeds list is back

On travel computer:

Favorites:
- with TweakUI, Special Folders, select as location C:\Documents and Settings\cubbie\My Documents\My Dropbox\Favorites
-- go to IE7 and yes, all the Favorites are there

Feeds
-- in IE7, File > Import and Export > Import Feeds, selected feeds.opml in the Dropbox folder
-- go to IE& and yes, the feeds are there

Just thought some of you out there might find this helpful.