Skype today announced the launch of advertising in Skype software, which will appear in the Home tab of Skype for Windows starting this week. This move represents the first time that advertising will appear in Skype, giving brands a unique opportunity to be part of the Skype experience, which has enabled millions of people around the world to do things together when they’re apart through voice and video calling, instant messaging, conferencing, and more.

Skype has partnered with leading advertising companies: Meebo in the US, Ad2One in the UK, and Ströer Interactive in Germany to sell advertising for Skype in each of their respective markets.

With 145 million average monthly connected users for the fourth quarter of 2010 and 29 million concurrent users at peak times, Skype’s reach and engaged user base makes it an attractive platform for brands to market their products. The first advertisers to sign up with Skype include: Groupon, Nokia, Universal Pictures, and Visa.

“We’re really pleased by the initial response among advertisers. We believe advertising on Skype helps fill a creative gap by giving brands a platform that has broad reach and global engagement, while also supporting large-format, rich and interactive ads,” said Doug Bewsher, Chief Marketing Office for Skype.

Skype “Home” provides a sponsored large masthead space at 650 × 170 pixels expandable to 650 × 340 pixels for advertisers to display ads that can include audio or video. Since the ads are on Skype, advertisers can add a Click & Call button in the ad as another call to action. In addition, it allows people to share the ad to their Facebook or Twitter accounts, and with one-click, ads can also be closed with the Close Ad button.