Hi Answerman, and welcome to MyDellMini!
Bearing mind that this post was first started over four months ago, well before the final version of Windows 7 was available, there are obviously later versions of most necessary drivers now available.
Although you say that you had the same problem, was that possibly with a pre-release version?
As you probably realise, evem after a brand new Windows 7 installation, followed by the essential Microsoft updates, it is also necessary to install the JMicron drivers, which can be found on the Dell driver update page for Windows 7 appropriate to your particular model, to satisfy Device Manager, in so far as the card reader is concerned.
It may well be that the solution you mention will help some users, but I would personally recommend that they try out the more standard line of approach first. I find it quite encouraging however that Dell do seem to have been quicker than some other Netbook manufactures in publishing Windows 7 driver updates, especially for components such as wi-fi cards etc.... and there are also some new Realtek ones on there as well!
Edit: I hadn't read brookheather's reply when I wrote this!