Ok, I tried it here at work and it worked the first time out of the box. To detail what I did:

EDIT: This only worked the first time! As soon as I closed GAIM and re-opened it I was never able to login again. I deleted the account and changed options to no avail. Perhaps I'll see if I can recompile the 2.0 version...

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1) From the command line as root I did:
apt-get install maemo-gaim-protocol-jabber maemo-gaim-protocol-meanwhile maemo-gaim-data maemo-gaim

2) After the install start GAIM and select the meanwhile protocol for a new account

3) Enter your Notes login and password and optionally click the remember password box

4) Select the Protocol Options tab and enter the fully-qualified server name and verify the port is set correctly (my server uses the default of 1533)

5) Click the Hide client identity box

6) Click Save

7) Click Sign on

I apologize if the instructions are pretty basic since I really didn't have to do anything special to make it work.

Larry