@retsaw
Nope, if done properly - see Phones with full metal body. In fact, it can boost reception (even without using external antenna). I've already took this into account while making project Nevertheless, good point, worth to mention.

@bipinbn
Nope, it's wrong assumption. It heats up, because heat is accumulated (due to plastic body). With Aluminum body,l heat would be dissipated more rapidly, which would make it both more pleasant to touch and - what's actually much more important - more healthy for N900 electronics and battery (due to lower operating temperature).

/Estel