SD vs MMC

[mystvearn]

I have just purchase a digicam, and it can use both cards. My previous cam only used CF. I am not sure why this cam can accept both. Or are SD and MMC the same thing?
Which is better/cheaper, SD or MMC? I am using a Canon S3 IS. Just bought it. :)

[glc]

SD is considered better, it's newer technology. They are both the same form factor.

[mystvearn]

better as in faster?

[bailey]

not necessarily faster, but more capacity