I saw Alexisonfire at the annual 'Soundwave Festival' (I'm pretty sure its just an Australian festival?) in 2008 and saw Maylene and the Sons of Disaster at the same festival in 2009 (earlier this year.) Seeing as I was going to the festival to see other bands I probably wouldn't have gone to see Alexisonfire or MATSOD by my own choice but in the end I'm glad I did because they were both pretty awesome! So yeah as I'm not that familiar with either band I can't really comment in depth except to say that they were entertaining. Alexisonfire had a huge crowd and it was bloody insane (I almost died) and MATSOD had a tiny, tiny stage and small crowd which was a little disappointing but also good because I was in the front row! Both worthy to check out live, though.

I'm impressed by all the people even remembering who they're seen live, I can't.
I have seen 2 or 3 a year since 1979, the most entertaining was Kiss.

According to the list I made on RYM, in order except for repeats (placed in order based on most recent attendance):

Marilyn Manson
311
Cypress Hill
KMFDM
Meat Beat Manifesto
Ministry
Download
The Crystal Method
Hootie & The Blowfish (x2 because of girls both times!)
Dave Matthews Band (tagged along with friends)
Phish (tagged along with friends)
Blink-182 (x2)
Less Than Jake
Mr. Bungle
Lagwagon
Suicidal Tendencies
The Legendary Pink Dots
Dead Voices on Air
ohGr
Tool
The Jealous Sound
Cursive
Built to Spill
Modest Mouse
Since by Man
Christiansen
This Day Forward
Rise Against
Coheed & Cambria (Claudio solo acoustic)
Thursday
Thrice
Sonic Youth
Mouse on Mars
Ratatat
Skinny Puppy (x2)
The Mars Volta
...And You Will Know Us by the Trail of Dead
Juno
Plaid
Lymbyc Systym
Les Savy Fav
Prefuse 73
31Knots
Amon Tobin

Also in order of most recent, not including local bands.

The Mountain Goats
The Hold Steady
The Felice Brothers
Deer Tick
The Rural Alberta Advantage
Rogue Wave
Matt & Kim
Flosstradamus
Team Robespierre
Green Day
Vampire Weekend
Ra Ra Riot
Wolf Parade
The Listening Party
Tegan and Sara
An Horse
Bob Dylan
Willie Nelson

You do not know how jealous I am of you getting to see Rodrigo y Gabriela live.

My friend just saw him last night. He said the show was amazing.

It's a him and her, a duo hence the "y" Spanish for "&"

But I would love to see them live, I heard they do a ton of Metallica covers and their new album 11:11 is one of the best albums this year hands down.

Yeah I haven't listened to them at all yet. I hadn't even heard of them until the night before last when my friend asked me to download 11:11 for him. But now that I have the album I have no excuse not to investigate. My friend said the self titled is his favorite, would that be a better starting place?

Either or, doesn't really matter, instrumental flamenco is awesome no matter what way you slice it. Their self-titled album has an awesome rendition of "Orion" by Metallica and "Stairway to Heaven" by Led Zeppelin.

since im not really into bands ive seen;

ratpack (x2)
angerfist
darren styles (x2)
suburban delay
tiesto
giovanni ferry
the rhythmic state (x2)
bass generator
obsession
marc smith
malorca lee
billy bunter
styles & breeze
korrupt
madman
george bowie (x2)
joe deacon (x2)
gammer, met him too!
sharkey
joey riot
guru josh
ian van dahl
chill FM
tommyknocker
kutski
brisk
organ donors
Masters of hardcore (most of them)

most people wont know. but there all pretty well known in the kind of music i listen to. thats when i couldnt see past Hardcore/Gabber.