Just going to post a few apps here (that may or may not have been talked about already lol)
Just downloaded last night :
iRemote (free) -
https://play.google.com/store/apps/details?id=com.kep.remote.free&hl=en
It's a free app that allows you to control your itunes via your phone, when you turn it on it connect to your itunes, then you have to enter a 4 digit code into itunes to fully pair them and your all set, you can skip tracks, increase/decrease volume, view playlists etc, found it to be a very useful app - used it last night, turned off monitor and kept pc on, lay down and listened to some music, pretty handy app - they paid version removes the add (which doesnt seem to bother me) and gives to access to the app via widget.
AirDroid -
https://play.google.com/store/apps/details?id=com.sand.airdroid&hl=en - Been using this app here and their for a while now and it allows you to wirelessly connect to your android phone via pc (well web browser), you start AirDroid on your phone, go to the website and enter your code and your set to go, you can then copy and move files from your phone to pc or vise versa (this is what I use it for lol) , since I first downloaded it though they have made some changes, the one that I noticed the most is that they have limited how much data you can transfer each month and offer a premium version which bumps this to 1gb, however I've personally never gone over the limit as I only use it here and their for the odd file etc
RC Bluetooth -
https://play.google.com/store/apps/details?id=com.truetel.svc.asus&hl=en - I'l guess that this particular app may be more well known on the forums as its from ASUS, and for those that have the compatible motherboard to use, the app lets you monitor and tweak your system on the fly, it shows you temperatures, voltages (which you can alter if you wish) and a few other nifty stats, one of functions of the app I personally enjoy is the ability to remotely restart and shutdown your pc - so for example - last night when I was using iRemote to listen to music in bed, when I was finished with I tunes I could have loaded up the RC Bluetooth app on the phone (which I had) and powered down the pc - handy

- one gripe atm however, the cpu multiplier display is constantly showing 0, so even though it has all the rest of the settings displayed there appears to be a bug atm with my system (because in the beginning it would display and I have since uninsulated and reinstalled the app on my phone with no change)
So those are 3 apps I personally enjoy and want to share with people, can be very handy apps