compactflash cards

Using a Nikon Coolpix 2100 (only 2 megapixels) this card is really very fast. It writes almost instantly, it seems, compared to the Lexar card that came with the camera. Even uncompressed 2 megapixel shots write in less than a second, so you can shoot a lot, and for smaller images (like 2 megapixels) the capacity is over 500 compressed, or over 250 uncompressed.... it's great.
Lifetime warrantee on the card makes me comfortable it's not going to crap out (I just got it yesterday, so I can't comment on it's longevity, but there's that lifetime warrantee, so...), and it's really affordable from Amazon.com.
I recommned this memory card with no reservations.

I bought the Ultra II 256mb flash card for my Canon A80. The read and write time is very fast compared to other memory cards I have used. You don't have to wait for the memory card to catch-up when you're in a hurry to take the next shot. Great for any type of photograpy. Most SanDisk memory cards have a 2 year warranty. This card has a lifetime warranty. I have been very pleased with the speed and reliability of this card.

At first I was a bit hesitant to get Sandisk products because I've heard so many people complaining. But after doing thorough research, I found that the rest of the brands were being equally lambasted by users. So, I decided to choose based on technicals and not opinions. Well, this CompactFlash card is quite powerful and what was the bearing point for me to lean and buy this is its price. I've used it to record digital video clips, I've taken pictures of all sizes and with different visual effects, I've done high-speed shutter (~2.2 shots/sec @ 1024x768) and it works phenomenally and flawlessly. I have not had ANY of the errors people write so much about and I'm actually sure enough that I'm willing to recommend it to others.
The 256MB its sufficient for about 200 3.1-Megapixel high-quality pictures. Which can hold a weekend's vacation worth of pictures without having to erase or transfer them to your computer. However, if you can afford the extra $50, I suggest buying the 512Mb one. In short: good value, excellent performance, good price and good quality.