In response to the original question, I have one of the nuelectronic tft/lcd shields (the 2.4" version) and found it an interesting sheild to use. It does however have a number of drawbacks, fristly there are very few i/o pins left. I seem to recall only about 3 or 4 analogue pins including the ones used for I2C communications.
The distance between the 2 rows of pins is slightly wider than it should be for an arduino shield. The pins are bent inwards slightly to compensate but still tries to force the arduino connectors outwards.
The display was stuck to the PCB using double sided tape which tended to lift around the connector end so a dab of glue fixed this.
The library originally available was pretty basic, there was a recent update and it has improved with more demos showing a simple button meny and text (although the text demo didnt seem to work for me). There is one issue I have found with the bitmap demo in that it displays the image in reverse.
I've not had chance to play with the updated library yet other than running the demos.
The old library seemed to have problems with the touchscreen reading functions being a bit on the noisy side.
I did do a write up some time ago which needs a bit of an update now the library has been updated, its at http://blog.thiseldo.co.uk/?p=450
Hope this helps