For your ISO burning question, K3b comes to mind first. Although it is a KDE program, a lot of people still use it in Gnome. It is the most complete burning program for Linux. It you want a native Gnome app then Brasero will do the job.
I highly recommend VLC as a video player. It will play all the formats without requiring extra codecs to be installed. I recently switched to it because none of the other players would consistently play all of the videos I wanted to watch. I'm actually planning an upcoming blog post about it because I've been so impressed.
Linux App Finder
Managing ISO Files and Playing Videos
For your ISO burning question, K3b comes to mind first. Although it is a KDE program, a lot of people still use it in Gnome. It is the most complete burning program for Linux. It you want a native Gnome app then Brasero will do the job.
I highly recommend VLC as a video player. It will play all the formats without requiring extra codecs to be installed. I recently switched to it because none of the other players would consistently play all of the videos I wanted to watch. I'm actually planning an upcoming blog post about it because I've been so impressed.