I am trying to install GPE-Calendar or Dates programs wout any luck, they report library LIBLZO1 is missing. I have searched everywhere and found LIBLZO1_1.08-1.2_arm or LIBLZO1_1.08.3_arm which fail to install reporting incompatible package.

Where can I the correct LIBLZO1 or other PIM programs.

After trying several repositories looking for the right library for LIBLZO1, I finally was able to fix the problem by re-installing the latest ITOS2006, you can get the latest image from the Nokia website:
http://tablets-dev.nokia.com/nokia_770.php
and follow the instruction to reflash either from root or using the Internet Table Software Update Wizard, I used the later and it was not too bad it did not took more than 10 minutes. You will have to install all apps again, this time no issue with GPE-Calendar or any other requiring this library.