The Livan signing is not a good one by the Twins, but it's not without it's merits. I doubt he'll pitch well though. And I think I'll adopt Livan as my 2nd least favorite Twin (Monroe would be 1st). But maybe Livan surprises everyone and throws a solid 4.5 ERA this season and allows the Twins to sort out the rest of their SP. It should be noted that Livan is also moving from a hitters park to a slight pitchers (maybe neutral) park. That could cancel out most the NL to AL effect.
Every pitcher in the Twins rotation is questionable heading into the season.
Baker is the most reliable. Hopefully he pitches like '07, but he was a disaster in '06.
BOOF! might turn things around, but he imploded spectacularly in '07. I'm bullish on him this season though.
Liriano should be healthy, but even then he might need 1-2 months in AAA to build up strength. I'm expecting him to begin the season in the Twins rotation, but that's not a gaurantee. But the early reports have been encouraging.
Slowey should be a solid starter, but he hasn't proven that yet.
Perkins had < 50 IP last season. More than 150 IP out of him is a pipe dream. And I think he's struggled with random injuries every season in the Twins system. Could still end up in the bullpen (even if Livan wasn't signed).
Blackburn, Duensing, and Humber will probably get plenty of chances getting called up for whichever starters struggle or are injured.
Swarzak and Mulvey have barely pitched at AAA yet. They don't deserve to be called up before september, but could fill in if someone is struggling.