Lpc2000

>
>  Isn't all of the information (with the exception of the cryptography
>  details) available publicly for SD?  I know that the interface
>  specifications, protocols and commands for implementation of SD are
>  pretty widely available.

Yes and No.
If you go hunt for the current specs you arrive at the SD Card
Association. A stripped down version of the spec is available as a free
download, you have to pay (and AFAIK become a member) to get the full
specs.
I am not sure about use of name/SD compatibility and the logo on your
commercial product. It may be that you have to become an SD Card
Association member but it can also be such that you are allowed to use
this when you use a product from a member (e.g. use an SD interface like
in the LPC3000).

The public available spec is not complete. It does not mention any
commands and responses that are used to communicate with the card. Some
companies seem to relax this a bit an they put a modified version (or
their implementation of the spec) as free on the web. I know that Toshiba
and Sandisk have specs on their websites that contain the full
information.

>  What is it that this expensive SDIO membership gets you?

Being an SD Association member gives you access to the latest specs. The
specs for SDIO (used by I/O cards like Bluetooth, 802.11g wireless, camera
modules etc.) I could not find for free on the web.

For most of us the specs from SanDisk or Toshiba will do.
Also the older MMC specs will do since the SPI mode for SD and MMC is the
same.

Rob