How do I get dyndns to look at a port besides 80 for web traffic?

I also use my http://dyndns.org account to look at other programs I am running on my home network like FTP, RDP, webcam, and so on. I do not want to mess up these other programs. My IP address changes about three times a day at home. I just moved and my new ISP blocks port 80 and 25. I want to get my apache server back online. Any links to info would be great. I found WebHop, but I don’t know if that’s what I need to use? If I use webhop am I still going to be able to hit other items I have port forwarded on my network?

Thanks, B.H.