My old phone is a HTC 3125 (Right) and my leatherman (left) and the HTC Fuze (middle). One of the things I miss is the external screen on my old phone, but that's minor over getting a touch screen!
When opened it's clear that the Fuze is much better at messaging. The vibrant screen is light controlled and the resolution is excellent (640x480)... better than almost any other phone.
The camera on this is very nice in that it's auto-focus. I believe it used the same idea as a CD reader by using electo-magnets with a lens element. The reason why I say this is when trying to focus on an object really close and it gets a lock, once I let go of the button it snaps to return to normal state. --- This is another nice feature, all the buttons are captive in that a touch activates a first level and a press is another (like a SLR camera button).
So, as stated above I did many, many upgrades to the base install. Here's a few of the things I found particular useful and stable (Not going to link since they can be updated - most of them are from http://www.freewarepocketpc.net)
- S2U2 - Slide to unlike like iphone (required due to lack of locking).
- Advanced Configuration Tool - Tweak it! Used to increase cache sizes to speed thigns up and also to improve battery life
- Diamond TF3d Config - Tweak Touchflow 3D settings (also used to remove a tab)
- Diamond Tweak - Another tweak, similar to Advanced Config tool
- Google maps - Boo ya! Also included latitude :)
- Gremote - use the phone like a mouse, in the air :) Uses accelerometer for positioning.
- HTC Album TP2 - Upgrade to album viewer in this release.
- Microsoft Live Search - Like google maps but can accept voice queries and is sometimes more accurate.
- MoDaCo Smartphone GPS Activator - enable GPS to be useful for other things
- Power Guard - see what consumes the most power (typical Idle is 80mA-100mA)
- Seismo - neat little tool that uses accelerometer. Hit the table and see!
- Total Commander - Must have for registry hacks
- WM6.1 fix for smtp mail [WindowsMobile61-KB958639] - Required to send email with this version (link to MS)
- Fuze PTT mod - Stupid PTT button was useless, remap to camera or something.
I got the MS Dev packages (free!) for windows mobile and plan on giving that a try to see what I can do with the g-sensor and what not.