Yeah quite a few actually. The only shaky application seems to be the Alchemy game... It wasn't until I installed it that the problems started occurring. Also, that free MP3 Ringtone Maker might be suspicious, but I've had that since I got the phone, which was around Christmas time, and nothing really seemed wrong. I checked my running applications and I didn't notice anything suspicious except FOTA and PicoTTS.
Take a look at your battery use. That should give you an indication of what's running and more then likely it's reducing the life of your battery.
But as far as it being warm like that, I wouldn't replace the phone. You'd be surprised at how hot these phones can get before the processor is damaged. I'm not saying don't do anything, just don't get too worried either.