Blacknight is an Ireland based, ICANN accredited domain name registrar and hosting company. The company is celebrating its tenth anniversary by holding a drawing for a Google Nexus 7 tablet with Android 4.1 Jellybean.
It looks like visitors can enter up to 15 times each, and one random winner will be drawn in a couple of weeks. So far, there have been under 350 entries, so it looks like you may have decent odds to win (better than the lottery!). You can sign up via Facebook or with an email address, and no purchase is necessary to enter.
As with every type of giveaway, there are some terms and conditions, so check out the blog post and contest widget page for full details. Congratulations to Blacknight on its 10 year anniversary.