I am a big fan of Google Apps for your Domain. However, there is one area where this Google product falters; integration with other Google apps.
One hope I had after migrating my own domain to Google apps was that I would be able to abandon my regular gmail account and use my primary email address (firstname.lastname@example.org) login with all of the applications provided by Google.
Google Apps for your Domain doesn’t seem to integrate with finance, rss, blogger, picasa or any of the rest. Hopefully, this will happen soon.
In the mean time I have all the mail delivered to my primary address forwarding to my gmail address which is the opposite of my original plan.