Co0kieMonster has made an excellent mod for Sense 2.5. It increases the number of programs in the home tab and the number of appointments. When sliding down, the list of appointments will expand to 5. Sliding up will show a 16/20 grid. There are 3 panels through which you can slide. Sliding up again will make the home tab more empty, so you can better see the wallpaper.
This mod only works for WVGA devices with Sense 2.5.
This is yet another 16/20 QuickLinks mod among many on XDA. However it has a few extras: extended appointments view, clear view, grid view in add program, multiline text labels. It can be configured for 16 or 20 quick links via registry. The default after install is 16.