I'll be there. Isn't Beck opposite of Plant/Krauss? I don't know how their set is going to translate to a festival atmosphere. But, in many years and hundreds of years of shows - their show at MPP was one of my top-5 of all time.
Beck tours much more regularly than I'd expect Plant/Krauss will. I'd really suggest checking out their set.
As far as my conflicts go... as different as they are, Patty Griffin and Gogol Bordello. But, with two Gogol shows at the club coming up, I may just have to go see Patty and wait until '09 for Gogol. Neko is opposite of Silversun. I haven't actually managed to see either to this point, as surprising as that is... I'll likely catch the start of Neko, then head over for the end of Silversun so I can be on the same end where Blues Traveler will be playing.
There aren't a ton of other real conflicts, for me. As much as I want to see Plant/Krauss again (hoping for When the Levee Breaks, as they played it on most of the rest of the tour, and not here) I'll likely spend the Black Keys set positioning myself for them, and may take in the Keys aftershow.