It is probably around here somewhere in this thread, but I am on a slow connection so I'll just put a howto on what I did.

You need:

PC:
Ubuntu 9.04 or higher
Tomboy

Tablet:
Maemo 4 OS 2008 or Maemo 5
Conboy

Cloud:
Ubuntu one Account

1) Subscribe to Ubuntu one. Briefly, ubuntu one is a cloud based file storage like dropbox and others. It has the added benefit of being syncing tomboy notes and making them available on the ubuntu one site.

Follow the instructions here that are appropriate for your system. On 9.10 and up the ubutnu one application part is preinstalled. If on 9.04 you can install per the instructions above.

2) Grab Tomboy:
3) Grab conboy from the repositories if you do not have it installed.

4) Backup your notes directory! If you are starting fresh no worries but every once I've seen reports of people loosing notes here and there. If you have a bunch of notes directory on your tablet or on our pc back those up. The notes are in:

/home/user/.conboy/ on the tablet
and
~/.local/share/tomboy/ for the latest tomboy on the ubuntu box

just do a
and a
5) Sync tomboy:
There are instructions for this in the help section under syncing. Essentially go to preferences and use 'tomboy web' as the service provider put in:
https://one.ubuntu.com/notes/ for the server and connect. You will get an authorization screen from ubuntu one. Once you enter your user name and password you are good to go with tomboy.

6) Sync conboy:
goto to the settings and enter
Enter in http://one.ubuntu.com/notes/ in the address bar (on the n800 version its the text field to the left of the authenticate button).
Hit the authenticate and a browser will open and allow you to enter your username and password for ubuntu one.

Now your notes should be synced! Its helpful to note that your notes are also kept at https://one.ubuntu.com/notes/ . You can review or add notes by dropping that into a browser and logging in. Then those notes will appear on your pc and tabler when you sync them. Hope this helps!