Would you like to play your keyboard, electronic drums or other MIDI compatible device through your iOS device? Yes, please. Thanks to IK Multimedia’s iRig MIDI, you can do just that. It’s a dongle for your iOS device that accepts MIDI In, Out and Through, which opens a number of doors for electronic musicians.

It’s almost Valentine’s Day, which means you’re probably out spending all of your extra money on stuff you probably don’t need. That’s okay, you can still get some apps for free. This week there’s a new free online multiplayer Battlefield game from EA. And I found a plethora of limited time freebies. So get to it.

The Line 6 Mobile In is a digital guitar adapter that uses the dock connection to interface your iOS device with your guitar. But there’s more; a whole app more. As if a digital input that works with other guitar effects apps wasn’t enough, Line 6 is giving away their Mobile POD app, and it’s awesome.

Whether you’re trying to be more organized, want to see the latest app from NASA or just want some paid apps for free, you’re going to be happy with this week’s list. There’s a great organization app called Wunderkit that promises to keep you on track. NASA released a traffic controller game, and Steam Mobile is out of beta already. Then there are also all those limited time freebie apps. Enjoy.

Everyone loves dinosaurs, so it’s difficult to think of a way to make this subject more interesting than it already is, but M5859 Studios has somehow done it. They’ve announced an iPad app called Inside the World of Dinosaurs. It’s a comprehensive and fully interactive digital dinosaur encyclopedia that’s narrated by, wait for it, Stephen Fry. Investigate 3D models of 60 dinosaurs from Archeopteryx to Zuniceratops.

If you aren’t familiar with Vito Technology’s apps, here’s a rundown. Star Walk is a tool for stargazing; it helps you identify the objects and structures in the night sky. Solar Walk is a 3D model of the Solar System and Geo Walk is a 3D world fact book. These apps are great for anyone who has even the mildest of interest in astronomy, the solar system or Earth.

This week on the Free Apps Roundup: Can’t tell what the song you’re listening to is trying to say? It can be difficult. That’s why Shazam is back with a new app to add information to your music. Shazam Player will stream the lyrics straight to your device, so you can finally know what Fall Out Boy is saying. In addition, Steam released their beta mobile app, and I found a number of great limited time freebies to keep your device brimming with apps.

Along with rolling out Boxee version 1.5 to the boxes, you can now get additional content into your Boxee box with the Boxee Live TV tuner. It’s a USB dongle that plugs into the back of your Boxee Box and delivers over the air (OTA) content into your Box, giving you yet another reason to cut the cable (bill). This makes the Boxee Box the first mainstream set top box to deliver over the air and over the top (Internet) content. Try to do that with your Apple TV.

From the minds that brought your the Pogo Stylus comes quite possibly the coolest idea for an iPad 2 stand. It’s called the Magnus, and it’ll hold on to your iPad 2 with the miraculous power of magnets. It’s a simple piece of aluminum with strong magnets embedded inside that hold on to the metal backside of your iPad 2.

It’s time to take your mixing seriously with Numark’s iDJ Pro. It’s a DJ controller that makes use of your iPad for a completely new DJ experience.