I'm getting the sense reading this thread that very few baseball fans outside of Chicago know about Brian Anderson, a top prospect in the White Sox organization. He played well in a few late season apperances with the White Sox, showing good power and very good defense. To the extent that he might have lesser offensive numbers than Rowand (by no means a given), the rationale is that Thome is a BIG upgrade over Crazy Carl as a DH. And yes, Thome knows he's coming over as primarily a DH, with backup duty at 1B. That's why he agreed to waive his no-trade clause. Also consider that Kenny Williams is not done. He still might pursue Juan Pierre. Even if he doesn't, however, Anderson has been seen as a possible replacement for Roward for at least a year now, with Roward being the most likely every day player moved this offseason.
As far as Konerko's reaction to this move, Thome and Konerko, I believe, have the same agent. The White Sox have consistently advertised their search for a DH to replace Everett, someone who could also play some first base. The two main concerns are 1) Frank's health and 2) re-signing Konerko, in that order. This does address both concerns, but it does not detract from the top priority of Konerko, and I suspect he knows that, since the club has very publicly been pursuing this move for weeks now.
As far as is health, the back issue has been debated since before he went to Philly. He has consistently put up 40-hr seasons since his back became a "concern." Last year was his first year missing significant time, and that was for an elbow tendon. If you think that's a chronic injury, then so be it. The White Sox medical staff will of course examine that.
My personal concern with this move is where Frank Thomas fits into the developing scenario, especially since Konerko is still the top priority. This is mostly a sentimental consideration for me (and virtually all other White Sox fans), as it wil be VERY painful to see him in another uniform. But his health is far from certain, otherwise the Thome deal would not need to be done.
The upsides: 1) We didn't give up any of our frontline pitchers. We were afraid the Phils would want McCarthy or even Contreas; 2) The Phils are sending $22 million with the deal. Thome is owed $44.5 over the next 3 years; 3) We didn't give up any of our top minor league prospects.
Downsides: 1) Thome's elbow and age. Covered this above; 2) Anderson is quite a talent, but for the most part unproven (in the same sense that Palpelbon has shown readiness for the next level, but hasn't been called upon for an entire season). So were Iguchi and Jenks, however.
Overall, I like this move.