How about this:
www.dyndns.org ... if you use the MyDynDNS Custom service, you pay $30 one-time fee (forever) and you can have your dynamic ip address hosting a permanent webpage. I guess it's like the rest that people posted...but I like this one  For this one, you don't have yoursite.dyndns.org. You just use your purchased domain name and dyndns will get it forwarded to you with no interruption by them (no banners, popups, anything).
For their free service, it's yoursite.dyndns.org...well, they have more than just dyndns.org...but that's the main idea.
It's a nice service and it's a one time $30 fee.
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I'm a professional web developer. I'm good with PHP, Perl, Java/JSP, some RoR, XML, Javascript (AJAX as well), (x)HTML, CSS, etc.. Validated code is good; fully cross-browser code is better (you comply to your users and the software they use, not the other way around. Sorry!)
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