I'm sorry to hear they're not working on GPE calendar.
It's got a fair ways to go, at least to meet my needs.

I was disappointed to discover last night that disabling a calendar doesn't speed it up.
I need access to all my past events, but KDE gets really slow with big files.
I was hoping to break it into several calendars, and turn them on as needed.
I created a new calendar, with one event in it, and turned off the main one.
Didn't help the performance. Any ideas?

I can send you my unimportable .ics. It's 3700 events, 270k zipped.
It has a bunch of gobbledygook in it that Pimlico's Datebook5 put in the memo fields
to specify icons and links without screwing up the native Palm database.
I also have it with that stuff edited out.
KDE PIM likes it fine either way.

If you want someone to test sync solutions, I have Tungsten C and Tungsten T Palms.
No Linux desktops, though, just XP and OSX.