I'd like to see rendering that looks good on all browsers, especially the BlackBerry browser, Opera Mini, and other phone browsers. You can download free BlackBerry Device Simulators
and then visit mini.opera.com on the simulator browser to install Opera Mini. In order for your BlackBerry Simulator(s) to be able to access the internet, make sure to download the BlackBerry Email and MDS Services Simulator Package from the same page.
I'd also like for phpScheduleIt to work no matter what if any firewall or other software a client is running.
Oh, and I have not downloaded or tried it, but you can also get your iPhone emulator by downloading the free iPhone SDK