For GPU mining htmlcoin you will need the newest release of htmlcoin (2.0.2.0) and the cc miner from mghtthr.

Install HTMLCoin but dont start it with the icon, start it via the command line. For windows save this in a file, e.g. start-html-daemon.bat

chdir \Programme\HTMLCOIN2
htmlcoin-qt -server -rpcuser=user -rpcpassword=p -rpcport=4889 -rpcallowip=127.0.0.1

Change \Programme\HTMLCOIN2 to the path where you have installed HTMLCOIN

This will start the wallet and act at the same time as a server which ccminer will need to communicate to. Then you can start ccminer:

ccminer.exe -a htmlcoin -o http://127.0.0.1:4889/ -u user -p p --no-stratum

GPU is also solo mining at the time of this post, no pools are available yet.

Resources/Links

Unofficial HTMLCoin Mining Group, see the stickied post
Peter Bushnell, @bushstar about GPU Mining