MP3 players with memory expansion
CNET editors round up a bunch of flash-based MP3 players that offer built-in memory expansion slots. Includes models from SanDisk, RCA, and Creative.
In the beginning, MP3 players relied heavily on memory-card expansion slots, because built-in memory was painfully scarce. My, how the times have changed. Nowadays, internal flash chips offer up to 64GB of storage, and memory-card expansion slots--which almost exclusively take some form of SD media--are merely offered as an extra feature.
Luckily, there's a decent array of MP3 players currently on the market offering this extra, so if you're keen on the option of adding more space on a whim--or you just want to use memory cards a la MiniDiscs, swapping them in at intervals--you have plenty of worthy choices.