I'm currently offering 5 signed paperback copies via LibraryThing's Member Giveaway program (currently a 1 in 20 chance of scoring) and another 5 signed copies via Goodreads.
Both giveaways close October 23.
I'm also running a Twitter contest where you simply have to retweet the following to be in the running:
I want to #WinHalJunior with @spacejock http://t.co/hSg90eEH
That one closes 15th October.
Simon Haynes is the author of the Hal Spacejock and Hal Junior series (Amazon / Smashwords / other formats)