Just got my T3 - superb PDA. In reply to the MP3 issue, you just drag the MP3 onto the "Send To Handheld" application. When you next sync it's automatically moved to the SD card in the palm (MP3's have to live on external memory not internal).

Spookily enough, when I was looking to buy the PDA it was also between the NX73 & the Tungsten T3.

First off: The T3 build quality is excellent - no creaks or loose fittings. The slide action is very crisp too. It also feels really nice and compact in the hand and slim in the pocket. When you have it in slider-open mode, the screen seems huge! The screen is also extremely bright and clear (even on half brightness - the default setting - I assumed it was on full brightness when it was first switched on it was that bright).

As to my final decision making: The T3 64Mb & the landscape mode just swung it for me in the end. I really loved the "gadget factor" of the NX73 (especially the UK version with built-in Bluetooth which I would have bought) but knowing the T3 is state-of-the-art with the fastest (400Mhz) processor just seemed too good to pass up. My final theory went that if I'd bought an NX73, I would soon want more memory (built in) and not having the landscape option for web browsing would soon become annoying (more because you know it exists now on the T3 rather than just missing it!).

I reckon by next year sony will have released an NX93 (or something) and will give it a decent amount of RAM and use the now standard Palm API for using landscape mode. But in the meantime you get all the state of the art benefits of a device that is truly pocketable.

Just as an aside - I also played with a UX50 before buying the T3 but the screen is way too small, nowhere near as clear & bright and although a small unit it's still a bit wide for the hands. Also there's no portrait mode.

Hope this makes the decision easier! I've not thought twice about the NX since getting my T3! (I've just installed Salling Clicker too - SUCH A COOL PROGRAM! Browse my iPhoto library on my palm via a live BT link! & display iTunes tracks as well as the cover art!)