Social gaming startup Zynga is seeing some impressive traction. It now boats 129 million monthly active users across its portfolio of more than 30 games, according to both Inside Facebook’s AppData(see chart) and Developer Analytics. That’s up from about 50 million three months ago, and 30 million in April.

Zynga’s most popular games are FarmVille (the most popular game on Facebook with 50 million cumulative players), Mafia Wars (the second most popular game on Facebook with 25 million), Zynga Poker, and YoVille. The majority of Zynga’s users play its games on Facebook, but it also has games Bebo, Hi5, MySapce, and Friendster.

Heere are some fun stats about each of its top games:

FarmVille—sort of like a Sim Farm, where you grow your own crops and manage a farm, FarmVille users have built more than 40 million virtual farms (which is 20 times more than actually exist in the U.S.). Players buy 500,000 virtual tractors a day in the game.

Mafia Wars —Every month, 140 million “jobs” are done by aspiring cappos in this game.

Zynga Poker—This used to be calledd Texas Hold’Em. Every day about 150 million hands are dealt (more than ten times as many as are dealt on an averag day in Las Vegas), and on there are usually 250,000 concurrent players, so you can always find a game.

YoVille—A game where you furnish a virtual apartment, buy pets, and eat funnel cakes. The 17 million residnents of YoVille have bought 10,000 pets and 40,000 funnel cakes since August alone.

As Zynga continues to grow, so does the IPO talk (and the litigation). Its revenues, which is well above nine figures now, comes largely from its virtual currency, as well as ads.

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It’s been a long time coming, but it’s almost here: Tapulous is putting the finishing touches on Tap Tap Revenge 3, the next installment of its wildly sucessful iPhone music game. The game, which is best described as a “Guitar Hero for the iPhone”, will feature in-game song purchases, which were finally enabled with the release of the iPhone 3.0 software update in June. If there’s a game ripe to make a killing with these in-game downloads, it’s TTR. Tapulous expects to have the game submitted by the end of August, with general release soon thereafter depending on the App Store’s approval process.

So why does this matter? Tap Tap Revenge and its various spinoffs has been some of the iPhone’s most popular games since the App Store launched last year (in fact, a very similar game was very popular on jailbroken phones before the official store even launched). Gameplay consists of tapping your fingers to a song as colorful bubbles fall down the screen, and newer versions also make use of the phone’s accelerometer so you can shake it to the beat. As with games like Guitar Hero and Rock Band, TTR tends to appeal to a very broad audience.

But until now it’s been handicapped by one major obstacle: there was no way for users to pay to download new songs. On console games like Rock Band, in-game purchases have proven very lucrative with gamers regularly plopping down around $2 per song. But the iPhone didn’t allow for this kind of transaction until recently, so Tapulous was forced to sell satellite games like TTR Weezer and TTR Coldplay, which did well but never saw nearly the usage of the main TTR app. Now they’ll be able to license songs from directly inside the flagship app, which means the number of paid downloads will likely skyrocket. It will also likely be easier to get premium artists on the platform, as they will be able to sell a song or two at a time rather than entire albums.

As a teaser, Tapulous has sent us the following frustratingly small screenshot:

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