How to open a HTML file of my PC in iphone's browser?
If you're willing to install ruby (already installed by default on OS X), you might want to check out Annyong. You can basically point it at any folder and tell it to serve it on an odd port.

If python is more your style (also installed by default on OS X), you can simply type python -m SimpleHTTPServer to serve the current directory on port 8080.

Otherwise, I sometimes use Dropbox for quick transfer to my iOS stuff.