i hope the majority of the tour songs will be blackout/circus songs, with just 4-5 older singles...
My Setlist: no particular order:
CIRCUS: womanizer, circus, out from under, kill the lights, shattered glass, If U Seek Amy, Unusual U, Blur, Mannequin, Lace & Leather
BLACKOUT: gimme more, POM, break the ice, radar, get naked, toy soldier, ooh ooh baby, hot as ice
Older Singles: baby one more time, Crazy, Toxic, Overprotected
I think if she sings Out from under live, her sale will boost a lot because many people like her music but they dont buy her album just because they think she cant sing.
According to The Thomas Crown Chroicles blog (I don't know if this blog is reliable):
Seems as though Britney Spears recorded a grip of tracks for her Circus album with bonus and exclusive tracks popping up all over the various different versions in each country. We can also tell you about 2 unreleased Spears tracks to be on the lookout for that were produced by Danja and written by The Clutch. They are:
"Abroad" and "Take The Bait" both with credits to Danja, 4 members of the Clutch, and Marcella. Hit us up if you found them!
Prop to Tom of The Keepers on the info.
Yea TCC Blog is one of the most reliable blogs out there. I hope they end up getting leaked or Danja release a track on a mixtape or something. I put every song that Danja and Brit did from Blackout and Circus (including unreleased tracks) just to see how a collabo album between them will sound like. My vote is for a complete Danja/Brit album for the next one. The already proved they can do upbeat joints, mid-tempo tracks, as well as somewhat-ballad like "Blur."
I think if she sings Out from under live, her sale will boost a lot because many people like her music but they dont buy her album just because they think she cant sing.
No Way. Actually Britney sounds really good so it wouldnt boost any sales
Mr. Duff, I am not disagreeing with your list, but Blur is something special and would be a perfect 3rd single!
Out From Under - It's like an older version of Everytime
Shattered Glass - So Britney, Overprotected much, not so great for 2009
Kill The Lights - Piece Of Me much, not hatin' but it's kinda old now since we all *****d POM.
Unusual You would be great, but I prefer Blur as a single tho Unusual You is my fav song on the album.
Mannequin would be a SMASHING single but 3 dance singles in a row is so wrong for this era.
j/k
No Way. Actually Britney sounds really good so it wouldnt boost any sales 
....
Why do you say many women can relate to it? i Think if she is going for girl power she should use "Shattered Glass".