Have a look at mSuite from Commontime (http://web.commontime.com
). I happen to know that they are due to bring out a new version in December which will work with Mac OS Vn 10 onwards. mSuite is an excellent product for synchronising Notes and a Palm device. If you can't wait until December to do this, you can actually get it working before then. The December release will allow you to install the product on your Mac and synchronise through your hotsync cable. You can however synchronise wirelessly with the Treo here and now, if you have a web facing Domino server with your mail file on it.
If you contact Commontime directly and decide to buy, please mention my name.
Alternatively, you may want to contact a Commontime reseller, who will be able to help. Try http://www.throughboxit.com
. Again, mention my name if you call!