The average visitor to YouTube is costing Google between one and two dollars, according to new research that shows Google losing up to $1.65 million per day on the video site.

More than two years after Google acquired YouTube, income from premium offers and other revenue generators don’t offset YouTube’s expenses of content acquisition, bandwidth, and storage.

YouTube is expected to serve 75 billion video streams to 375 million unique visitors in 2009, costing Google up to $2,064,054 a day, or $753 million annualized. Revenue projections for YouTube fall between $90 million and $240 million.

The first of the multiprotocol chat clients, Trillian got its start nine years ago and had been updated with some regularity through 2005 and 2006. It was included in the Google Pack, a collection of freeware that Google was supporting. On the heels of Trillian 3.1, Cerulean Studios announced that Trillian 4, code-named Astra, was in development, and would finally port the service to Mac and Linux.

Except for the occasional minor announcement, that was the last big news about Trillian. Competition from more frequently updated services like Pidgin, Digsby, and Adium has drawn away fans, but now there’s a private beta of Astra that seems to be accepting invitation requests from everybody who wants one.

Microsoft on Tuesday confirmed that the next version of Office, code-named Office 14, will come in both 32-bit and 64-bit versions.

The 64-bit version is a first for both Office and for Microsoft’s mainstream desktop applications, though a number of its server products, such as SQL Server, are already available in 64-bit versions.

Office 14, which is expected to be called Office 2010, is slated to ship next year. Among its other notable features is the fact that Microsoft will offer browser-based versions of Excel, PowerPoint, Word, and OneNote, in addition to the traditional Windows-based desktop programs.

By extending the browser support to Firefox and Safari, in addition to Internet Explorer, Microsoft has said it will have the effect of also bringing Office to the iPhone and to Linux-based computers for the first time.

Two founders of Web content recommendation service StumbleUpon said Monday they bought the company back from online auction house eBay Inc., just two years after eBay purchased the startup for $75 million.

The founders, Garrett Camp and Geoff Smith, bought the company back with the help of investors including Ram Shriram of Sherpalo Ventures, Accel Partners, and August Capital, they said. Financial terms were not disclosed.

Camp will be chief executive of the company.