First of all, the evidence -
http://img135.imageshack.us/img135/8701/dscn2927br0.jpg
http://img390.imageshack.us/img390/5029/dscn2928ne0.jpg
Two old sort of blues boys enjoying a day out among the black t-shirt heavy metal brigade. At least that's what it felt like at times - easily 95% of the crowd was in partial or complete black, lots of serious boots, tattoos and piercings.....exhibit one -
http://img297.imageshack.us/img297/6907/dscn2933fr3.jpg
This made it all the more peculiar that we were there principally to see Little Feat and ZZ Top, neither of whom remotely fit a heavy metal-ish image. I made some very short notes on the other acts we heard -
Apocalyptica - not much to add to Andre's comments above, too distorted, too much electronic noise, took too long.
Opeth - bludgeoning noise metal death. Ugh.
Ted Nugent - why? A hunting accident would be a good solution.
Dicky Betts - I was less impressed than Andre. It's also fair to say that to an extent, I've been 'spoiled' by Joe and the boys. I felt that lots of the playing was sloppy, the mix was poor, and even though I understand that they're supposed to be an Allman Bros. clone band, I thought that three guitarists and two drummers was overkill.
But my day was always going to be about my first sighting of Little Feat, the band that was my NUMERO 1 from '73 to '78, in 31 years. I deliberately had no expectations so that I couldn't be disappointed. I wasn't. Of course this was a different Feat, there was no Lowell, but all the rest can still seriously rock. They are unbelievably tight and look like they could play in their sleep, even when they appear to be improvising. Paul Barrere has turned into a very fine guitarist, I was impressed. Fred Tackett does this funny thing where he hits his guitar strings with what looks like a pencil! They both play Fenders. 
(Which is something I would not have been able to write a few months ago when I had no idea about how you can tell Fenders from Gibsons).
I really enjoyed seeing them again. Even though the woman singer, whose name I haven't even bothered to google, has a very good voice, she's not for me.
From a distance, ZZ Top look like the Blues Brothers; when you get closer they start to look like escapees from a Star Wars set with their black clothes, black hats on backwards, black shades and long gray beards. But OMG, what a killer show!!! Billy Gibbons is the mutts nuts, the dog's danglies! What a player! What an act - the in-time moves, the repartee (eat your heart out Ted Nugent), white guitars, white on stage speakers and lots of white light. This was a visually as well as aurally stunning performance. In short, I was gobsmacked. Obviously, not on the Joe scale, but this set left me feeling very warm, happy and fulfilled. What more can you ask for?
P.S. I forgot to mention that we saw one guy of about our age with a Joe t-shirt; sadly, my classic 70's Little Feat t-shirt that I had on under my Joe shirt was the only Feat shirt I saw, which is kind of sad. 
RIP Iron Man
Rock On and keep the Faith
