Oops! Is this a cactus?
 

or a succulent of some sort?

http://i163.photobucket.com/albums/t...-07_2210-1.jpg

http://i163.photobucket.com/albums/t...-07_2211-1.jpg

Oops! Is this a cactus?
 

I think this is Ledebouria socialis.
It's a member of the Hyacinth family (Hyacinthaceae)
Images here
http://www.flickr.com/search/?w=all&...ocialis&m=text

Not a cactus. It'ss often grown in succulent collections as it is a
plant of semi-arid areas of South Africa.