Fetch color and scheme data:

Straight links:

http://www.colr.org/color/ffba13 - View color #ffba13
http://www.colr.org/color/random - View random color
http://www.colr.org/color/latest - View latest color
http://www.colr.org/scheme/728 - View scheme id 728
http://www.colr.org/scheme/random - View random scheme
http://www.colr.org/scheme/latest - View latest scheme
http://www.colr.org/tag/cheese - Linking directly to a tag doesn't work yet :(

JSON:

http://www.colr.org/json/color/ffba13 - data for color #ffba13
http://www.colr.org/json/color/random - data for random color
http://www.colr.org/json/color/latest - data for latest color
http://www.colr.org/json/tag/cheese - data for all colors & schemes tagged 'cheese'
http://www.colr.org/json/scheme/728 - data for scheme id 728
http://www.colr.org/json/scheme/random - data for random scheme
http://www.colr.org/json/scheme/latest - data for latest scheme

JSON only! You can specify a callback with the "wrap" parameter:
http://www.colr.org/json/color/ffba13?wrap=my_fancy_callback($response)"

RSS XML:

http://www.colr.org/rss/color/ffba13 - data for color #ffba13
http://www.colr.org/rss/color/random - data for random color
http://www.colr.org/rss/color/latest - data for latest color
http://www.colr.org/rss/tag/cheese - data for all colors & schemes tagged 'cheese'
http://www.colr.org/rss/scheme/728 - data for scheme id 728
http://www.colr.org/rss/scheme/random - data for random scheme
http://www.colr.org/rss/scheme/latest - data for latest scheme

Add one or more tags to a color:

send a POST request to http://www.colr.org/js/color/ffba13/addtag/
with "tags=X" in the request form data
where X is your tags, separated by spaces.

More to come:

If one of these APIs is a pain for you to use, or you'd really like to see a new API, please let me know