Summary: Great flash for your Nikon Digital camera, from the old, rugged, D70 right up to the D3s and D3X. With the Nikon Creative Lighting System (CLS) that was created for the D70 and just about every D-series DSLR after it, you can get the lighting you need and more. I use a D90, and in Commander mode, I can use three different channels and up to 4 flashes per channel to achieve the lighting configuration I need for my portrait work.
Summary: This flash is WAY better than the SB-900. I have bought a second SB-800 because I had one SB-800 and one SB-900 and I shoot weddings. I used to used the 900 and my second shooter used the 800, but my 900 started overheating after just a few shots, so I would have to take the 800 from my second shooter, leaving him with the crappy 900. SO, I will now be using 2 800s.
Summary: Look at the prices some of these places are charging! I got my SB800s for $329 when they were in production. The SB900 has more power, faster recycle, and tighter zoom (200mm as compared to 105mm on the 800). You can get those for $440ish. The SB900 does get hot and the thermal protection can shut the flash down for a cooloff. The SB800 doesn't suffer from that. That would be the reason to get an SB800 today. I most definitely would not pay over $340-50 for one though.
Summary: I bought a Nikon D-90 which is am incredible camera. and since i mostly shoot concerts in low light to medium high light the pop up flash just didn't have the demand i needed, so i purchased the sb-800 flash and all I have to say is INCREDIBLE !!!! WHAT AN AWESOME PIECE OF EQUIPTMENT.
Summary: Reason I am posting this is the PRICE on the SB800 is way way way to damn high....DO NOT BUY IT FROM THE SELLER IF THEY ARE OFFERING IT FOR 899.99. I got my off Craiglist(locally) for 350, he used it only flashed it 10x....
Summary: Faster recycle time time than an SB900. Slower user interface. Slightly smaller overall. Considering the price difference, this flash is a steal! If you're thinking about this or the 900, just check your bank account. Can you afford the 900? Then buy it. If you can't afford it, but you can afford one of these, get this. There's not a whole lot of difference, even in recycle times. You can't go wrong with either. Both will give you the same image quality in the end.
Summary: Right now, I have 1 SB-800 and 2 SB-900. The SB-800 is no longer manufactured. See the manufacturer's link at [....] The SB-800 has been replaced by the SB-900. So if you really want the old item, the SB-800, they are in short supply which explains the high price. Why would you want the old item over the new item? Maybe you have several of the old items and want to have a consistent group of flashes with the same menus and features.