For email testing, as well as other things..
http://www.stayinvisible.com/index.pl/test_your_email
The different whois tools available on the net can tell a lot about a ip
http://www.arin.net/whois/ for example, there are others too, just a matter of choosing the right one..I wrote one in perl long ago that I used one a website of mine to do Ping, Lookup, Trace and whois
There are also many tools available that hackers and security experts use to trace an ip..
http://www.tialsoft.com/mnettrace/ is one but I had a few better back in the day
The most common way to hide your ip addy would be using an anon proxy or chain several together, there are software that can do that like proxyrama or one could use one anon ip configured in browser and launch browser through sockscap using a socks proxy there, socks proxy is anon but hard to come by.
There are programs that will allow you to search for anon proxies or even scan for them, although your ISP would probably frown upon that. Guessing that deny.de would be able to provide clues as to what progs that might be. aatools will do in many cases though..
There are also wingates and such but far too technical to consider
So you want to do something semi shady and want to make sure you not get caught... usa an anon http proxy from Iran in Mozilla, launch Mozilla with no cookies, js, activeX and so on through sockscap, which again is sorted with a nice socks proxy from China.
Should provide you with decent security but of course not complete, if you want that you better add a random wifi spot that you'll never use again
Now you're close to secure, still most are brought down because they have this urge to brag about what they've done...Which is why I never do anything, just learn the theory behind it..
Oh I host this tutorial btw, not written by me but pretty good.
http://dingo.letzebuerg.biz/security/
Can also find some fun stuff here
http://www.icefortress.com/downloads/
You need a user : pass but I'm afraid you have to find that for yourself, easy js pw protection so not hard to break...