Tutorial on subnetting

currently working on the 291 material and i was wondering if anyone has their own little easy to understand tutorial on subnetting/addressing, i seem to be having some issues getting it down completely.......if you have any tips links or docs that have helped, please forward them my way i will really appreciate it.......
Comments
IP Subnet Practice
http://www.techexams.net/forums/ccna-ccent/38676-subnetting-fail.html
http://www.techexams.net/forums/ccna-ccent/38772-subnetting-made-easy.html
The last link in particular is good, explains it nice and easy. Anything in particular your having issues with? Post up, plenty of people willing to help.
Blog >> http://virtual10.com
I learned about Subnetting while studying for CCNA. The best explanation I found was in the Sybex CCNA book Chapter 3
http://www.techexams.net/forums/ccna-ccent/38772-subnetting-made-easy.html