This article is from the storage FAQ part1, by Rodney D. Van Meter with numerous contributions by others.
Pinnacle Micro (http://www.pinnaclemicro.com) makes MP drives with capacities of 650 MB, 1.3 GB, and 2.6 GB, with transfer rates up to 6 MB/sec(!). Reportedly they're developing a 4.6 GB drive (Apex), too. Pinnacle also makes 10x CD-ROM drives and CD-recordable drives. (rdv, 96/7/8)