The information provided by Sandisk for the Nikon D50 is inaccurate. It states that the D50 can use either SD or SDHC cards. It cannot. It can use only SD cards, and to a maximum of 2Gb.
Unfortunately, the only cards that Sandisk currently offers that are compatible with the D50 are the slow C2 cards. I just got off the phone with Sandisk support and they confirmed this.
Grant