I bought a 4 Gb. Toshiba MD about the same time I got the 20D, and now they're basically married. The big deal with MD's as I see it is that the Toshiba units were designed from the beginning to provide the kind of reliability that is needed in medical applications. That was the bigger market, at first.
In almost every case where I've heard about the Chinese "off-brand" MD's, they are to be avoided, as failure is basically certain in a short time.
More recently, I've joined the majority, and use only flash media. I prefer 2 Gb. cards, because they hold a lot from my 20D and 400D, but if one is lost or somehow broken, I haven't lost everything. I see people paying far too much for fast cards. Unless you shoot in continuous mode a lot, the write speed almost doesn't matter, because any good DSLR has plenty of buffer.