I've been using ESP for quite a while. Just found 0.7 today and it works mostly on my T-Mobile Dash Windows Mobile 6.0 Smartphone, but the Today Plugin does not at all. I get an Error Message when I try to install it, and the Details shows NotSupportedException at Microsoft.AGL.Common.MISC.HandleAr()...
On my Toshiba E805 Windows Mobile 2003SE the plugin installs but does not work, and does not show up in the "Today" settings as a checkbox (even after a reset). To make things worse I am not able to update my characters at all, although the Wallet display does work.
There is a "Order" registry entry for the Today Plugin that seemed to be missing under 2003SE but adding it did not fix the problem.
I do realize you specify WM5 but unfortunately neither of my devices is running that. ESP 0.4 - 0.6 work fine (mostly) on both devices.