Is that the Bonnie Raitt Strat he's playing on those?
Yeah, he loves that Strat on that song. Some interesting notes on this song: Dave started extending and improvising the solo when he incorporated this song into the sets with his solo band in the early 2000's. After Nyman joined the reunited Y&T in 2003 or so, they extended it into the full-blown duel tradeoff solo you see in those (although poor Nymann never seems to get much camera time when he picks up the second part of the solo). Another interesting trend that developed with the song when it is played in N.Cal. (don't know if it has caught on elsewhere)...There is a group of girls that typically get right down in front, center stage, at most of the shows. I know most of them. Anyhow, at one show (I think it was Dave's 50th birthday bash, but it might have been a different one), one of the girls began passing out blow pops at the beginning of the song, and the girls would...um...get a bit suggestive with them during the song. If you notice Dave looking down in the front of the audience and almost laughing during some clips of that song, that may be why. It's now firmly established Y&T tradition.
EDIT: Actually, I just noticed, you can see someone hold one up at 4 seconds in on the second video. She holds it up for a few seconds, then it disappears, and then she waives it around for the rest of the intro.
I'm guessing there were more off on the right side judging from Phil laughing. EDIT2: Yup. You can see another one on the far right at 4:40 when Nymann starts his solo.