Could you please tell me what addons you are using?

I see there is X-Perl, Some DPS meter (which ine exactly i can not tell) Some sort of scrolling combat text...

But I have absolutely NO idea what is the grey colored rectangle which, as far as I can tell, show you the status of your shamans spellcasting. I've seen there some messages such as "Spell not ready" or "out of range" And you have wery nice Buff tracker (upper left corner of the screen near map) i'd love to get the same for my team.

It will be great help for me in my future attemts to do heroics or normals with my team (now 46, but I level them pretty fast) to know what addons you are using and for what particular reason you've chosen each one of them.