Finally decided to go for a HSK test just for the fun of it. Naturally Skritter is my main source for practicing but some HSK test practicing is also very useful. So, here are some of the sources I have come across that do have nice test samples.

http://www.chinesetesting.cn/godownload.do
Nice site with manuals, sample tests, audio files for all levels.

http://www.konfuzius-institut.at/en/chinesische-sprache/pruefungen/
Similar to above but fewer resources.

http://www.hsk.org.cn/Download_E.aspX
More sample tests

http://www.chinauniversity.info/2010/12/hsk-test-free-download.html
More info and sample tests

http://www.confuciusinstitute.qut.edu.au/study/proficiency.jsp
And more

http://www.miraclemandarin.com/english/download/
a few more

http://www.tanos.co.uk/hsk/
and yet some more

http://popupchinese.com/hsk/test
Do have some nice podcasts and info even with the free account.

If anyone do have more I am all ear. There are several books that do come with a CD with much better tests and practicing. Got some in China last week as well. However, those sites are free;-)

I also am planning on taking the HSK for fun at some point soon - let me know if you learn any secrets to success!