As stated a good tripod is essential. I personally prefer a wired shutter remote just because it may have been a bit awkward for me with the wireless one, but any remote is better than none. Also, as you are probably going to be using fairly long exposures, if there is any wind, you may consider either removing or securing the camera strap somehow as every little movement will affect the picture. On the note of wind, if there is a breeze, pay attention to the direction depending where you are standing, as smoke can be an issue. If it is a fairly lengthy display and there is no wind at all, your 'cleaner' smoke free shots will be the ones you take earlier on before smoke starts to hang around (although this can work for a more dramatic effect)
I used a 4 stop ND filter for mine and exposure times varied, but my aperture was fairly small and it seemed to work ok.
Not sure I have this link posting thing right yet, but here's a few of mine from last September. This was my first attempt at fireworks shots, having done a lot of research and asked a million and one questions beforehand.
http://flickr.com/gp/2tiggies/4K0V36/
Here is another attempt from later in the year in the UK last year. Again, with a 4 stop ND filter. (And it was freezing!!)
http://flickr.com/gp/2tiggies/o7Y976/