So you got a stalker or just want to find out where somebody is, first off you need a IP stealer, normally this will be a redirect page in a link, ie the victim clicks the link that you sent telling them it was full of pics of Asian porn, it goes thru the redirect which picks up their IP and then forwards them to whatever page you have decided on.
For this example we shall use syntaxmaster.info, this one you have to register first, then log in, click Software Tools then IP Stealer.
For getting IP on Skype, Yahoo messenger or MSN Messenger click start > run > type in "cmd" > once you're in command prompt enter >"netstat" this will show you your active and non active connections, now send a file or get them to send a file and take a look for activity, the transfer port for MSN Messenger is 1863, you will have to find out the other ports for yourself, easy enough to google.
Once you have clicked IP Stealer choose where you want to send them, now you got the problem of that ugly long url.
Next go to tinyurl.com, put your long url in the box, you can choose a custom url but most of the good ones have gone, click make tiny URL and you got yourself an unrecognisable url to pass on to whomevers IP you want.
Once they have clicked the link their IP will be logged at the bottom of the syntaxmaster.info page, easy as that, you can check their IP location here.
If you want you can also set up a page on a free host, there are numerous scripts which are very small that will email you each time someone visits the page with their IP.