and in all honesty, hacking isnt so much as a strictly c++ thing as it is a computer science as a whole. im sure you could find a website that is directed at hacking
www.wowomg.com 's hacking site has a fair amount of information for hacking sql, reverse engineering .exe's etc.
it requires a bit of knowledge about networking, but its pretty easily overall
Hacking in the traditional sense is rapidly dying and becoming entirely too difficult. A lot of "hacking" anymore is just social engineering. People are always going to be easier to manipulate into giving you information than a computer.
For example, finding someones SSN is as easy as convincing them that they need to supply the last 4 digits for something (which is very common). The rest of the SSN can be figured out by knowing their birth date and place.
If you're just looking to show off for your friends then learning this will be the most economical use of your time. Yes this will make you a "Script Kiddie" and you'll have all of the respect that title comes with, but we all had to start somewhere.
personally i would use
http://geekbolt.blogspot.net . they have a link to another blog that lets you download a bunch of white hat hacking tutorials and a few black hat too ;).
@Fredbill: i would take a look at the script before doing away with the site as a whole. java script can be used as a valid tool to make sites cooler when used right.
@grey wolf: *wonder (sorry it just really bugs me reading it that way. not trying to be a grammar nazi). mines from blogspot so i doubt they have any viruses running