There is really no comparison between Datebk5 and Agendus:
Datebk5 is a great calendaring program that has the limited ability to show tasks and contacts in their native programs. I am a registered user of Datebk5 and pop it in from time to time to see if I don't want to put up with Agendus's (Iambic's) tactics. It never stays more than a week because I can't get used to it.
Agendus is a contact manager program - period. It can show you all that Datebk5 can plus pictures of contacts, different contact views, different task views and wallpapers.
On the Treo - it's contact management features (Contact History) shows you every task, meeting and cellular call made to a contact and it does so without having to link such as in the manual process of Datebk5.
Ok, now here goes Moose getting on his proverbial soapbox:
Datebk5 hasn't really changed in 18 months. It has come out with updated versions to handle new hardware but even this has been slow. Items to fix the T3 conduits weren't released in final form until March. Don't get me wrong - it's still a good program and one reason no one is complaining is because if you bought Datebk5 18 months ago all of these updates have been free, great the program hasn't changed enough to charge for an interim update.
Agendus has changed drastically in those same 18 months. However, they are charging for these interim changes. That, I my personal opinion, is ok. However, they have released versions that have been unstable on certain platforms and have not fixed these versions before releasing the next.
I think that version 6 was pretty stable and for the most part so was 7.06 but it did not address the T3 correctly and they needed to come out with 8. Version 8 had enough features added to it that I thought that the upgrade price of 9.95 was worth it however it has not yet been proven stable (8.04 is pretty stable) nor has it delivered all features as promised. I'm still awaiting the alarm issue to be fixed so that I can select any alarm on my Treo. I can set alarms and they will respond but I can't set a ring tone alarm as promised.
With all of my complaints: Agendus is the best, no doubt, contact manager software out there that is strictly Palm based. It has more features and benefits that are just to numerous to list here.
Their marketing approach leaves a lot to be desired with charging for updates that aren't stable and basically cause many of us to beta test for them even though we aren't paid or renumerated for it.
Is there a replacement - Datebk5 is the next best thing but for me it just doesn't cut it. If Agendus didn't exist, I'm certain to be singing the praises of Datebk5.
You can get close with MonthPlanner, WeekPlanner and SuperContacts or Contacts5. Contacts5, from PDAPerformance.com is supposed to be coming out with a program called Life@hand that is supposed to be the best of Datebk5 and Agendus but the public beta won't be released until 4th Quarter of this year.
You can see some info
here You can sign up for the beta
here
You can see though that there hasn't been a lot of movement on this site.