Safari seems snappier. Tapping on the address bar pulls it up almost instantly now. Streetview is fast and extremely cool (but I have to say that 1 Infinite Loop looks exceedingly dull. Note that there's no Streetview for Singapore yet). You can now turn off auto-correct and auto-capitalisation (can't remember if you could do the latter before). And hitting the home button if you are on one of your many other home pages takes you to the first page. Nice.
Remember not to update if you've got a jailbroken iPhone. Otherwise, have fun.
Update: Jon Petersen of iSinGeo points out that you can now search by postal code. Type in Singapore followed by the six-digit code and Maps will locate the place. Much faster than typing the full address. Thanks for that note Jon.
Maps related update: Jon's SinGeo website has a cool map of Singapore showing the ability of do reverse geocoding on Google Maps. Click anywhere on the map and it it will actually pull up the address of the spot. Quite uncanny.