Last Friday software developer BlindType announced in a blog post that it has been bought by Google.

BlindType makes software that it plans to sell to mobile device manufacturers and mobile OS makers. The software aims to bring tactile feedback back to typing on mobile devices, which was lost with the introduction of the touch screen that doesn't offer such feedback, the company explains.

Google earlier this week made its fifth acquisition for the month of August. The target this time was SocialDeck, which develops social gaming technology for mobile devices and social networks. The company's games include PetHero, Shake&Spell, and ColorConnect, and it also develops a social-networking platform called Spark that connects players across devices.

SocialDeck announced news of the acquisition on its Web site, with very few details.

On June 30, 2010, Amazon acquired one-deal-a-day site Woot.com.  While the $110 million all-cash purchase (as reported by TechCrunch ) did not warrant a press release from Amazon, the acquisition displays Amazon's prowess as a retail and e-commerce leader.

News of Google's latest acquisition, marking its ninth so far this year, was made public when the purchased company, called Bump, posted a letter on its Web site informing users that things were about to change.

On April 30 Bump's home page published a letter stating that the company had been purchased by Google, and thanked its users for their support. Financial details of the deal were not mentioned.