PageKite (disclaimer: I made this!) solves the same problems as localtunnel, but it is completely self-contained (written in Python, does not rely on ssh) which makes it very easy to install on Windows. Admittedly, you still have to deal with the command-line or at least edit the config file by hand, but a more user-friendly Windows GUI is in the works.
PageKite is free software (both the client and server) for those who want to DIY, but it's also backed by a start-up which provides all the service you need to get up and running in minutes.
