There are cards ending with 00, 01, 02, 03, 04 and 05, etc. It is probably a revision number. If you look on eBay, the cards with the higher ending numbers are selling for more - there is a big difference between the 07's and the 00's.
Interestingly, Creative Labs identifies the model for this card as SB0886 (http://www.ask.asia.creative.com/wwenglish/general/Products_list_audio.htm).
and points you to the same page for all updates.
Hope this helps.