Though Twitter’s still got money in the bank from their partnership last year with Bijan Sabet and Jeff Bezos, Biz Stone announced this morning on the official Twitter blog that a late night deal on Thursday closed an additional boost of capital from friends Peter Fenton of Benchmark and Todd Chaffee of Institutional Venture Partners.

As a result of the deal, Twitter, Inc. will get a new board member in Peter Fenton and looks to benefit from his experience in investments and as an entrepreneur in Silicon Valley. In regards to the startup finally creating positive revenues, Stone had this to say, “We are now positioned extremely well to support the accelerating growth of our service, further enable the robust ecosystem sprouting up around Twitter, and yes, to begin building revenue-generating products.”

Earlier this year the team had talked about producing a revenue model in Q1 of 2009, but will this new boost of funds push that further into the horizon? Ev mentioned the model wouldn’t be anything groundbreaking, but maybe this buys them a little more time to come up with that perfect model?

As always, feel free to chime in on what you think this means for Twitter. What do you think their focus should be now that capital seems to be a non-issue?

In this month alone we’ve seen some substantial cash thrown in several different directions. Here’s a list of who’s getting what – and from whom.

Yammer

After exhausting its $50,000 prize for winning top honors at TechCrunch50, Yammer has raised an additional $5 million in series A financing from the Founders Fund and Charles River Ventures. The Founders Fund is a seed fund comprised mainly of ex-PayPal execs.

TweetDeck

TweetDeck is a single-man development operation run by Iain Dodsworth. TweetDeck rapidly rose toward the top of the charts as one of the most used third-party clients. On January 16th, it was announced that nearly $500,000 in angel funding from Betaworks was secured. In the past, Betaworks also invested in Summize, TipJoy, and StockTwits.

Identi.ca

The open-source icon of microblogging recently received somewhere between $120,000 and $320,000 of funding from a Montreal-based VC firm called Montreal StartUp.

Techcrunch and Mashable are both reporting that Tumblr has raised an additional $4.5 million in a Series B round with Union Square Ventures and Spark Capital. This was a surprising announcement in these troubled times however this invest will play a critical role for the platform’s future.

Tumblr has been gaining traffic and the funding will provide additional runway. More importantly though is that similar to Twitter, Tumblr lacks any form of a business model. Along with the funding announcement, founder David Karp has announced plans to launch premium services early in 2009. There is still no word as to what these services will be, however, my hope is that they are the “big features” first hinted at in October.

From the Tumblr blog, “big features” were announced back in early October with the last interface update. Since then the team has only delivered the ability to “like” posts and a few API changes. Neither of which justify the interface overhaul.

To this point, Pownce has really been the only other player to leverage the premium business model. Upgrading a Pownce account to the pro version added the ability to store more files and provided an additional level of design customization. However, one of the benefits of using Tumblr is its flexibility. Users can already customize the HTML and add custom CSS. And honestly, with Pownce closing its doors today, I wouldn’t bet the house on that business model.

It will be interesting to see what additional features are going to be added to the mix from a platform that made its name from being simple to use and extremely customizable. It sounds as if Tumblr will be hitting the ground running in 2009 and we look forward to providing you more updates as they emerge.