That's tantamount to saying "I jail-broke my iPhone quickly, so I could use one of the many apps on Cydia to tether my laptop via WiFi" ... except you don't need an app for that because tethering is built into iOS. You need a different network provisioning file in the States, and elsewhere in the world tethering is enabled by default.
I liked the form factor of the HTC Aria but found his following points to be deal breakers, so am back to iPhone for now:
- every couple of days, you do need to reboot the phone
- no cellular data while you are in a call
- no cloud push in Android 2.1
- separate email apps for Gmail and everything else
- IMAP email is very weak; really weak
- the OS (and therefore the apps) are really clunky at switching between voice/data/wifi
I was also put off by the extremely popular apps carrying name brand logos that disclaimed association with the brand while asking permission to make charge calls from my number.