Yes, I was aggravated by this signing as much as the rest of you, but recently I've been trying to rationalize it. Since Castellini is a vet of the Cards organization, he perhaps had a good sense of Womack's intangibles before they made the move (and I really think DanO was following unofficial marching orders from new ownership when he did it).
The signing makes the most sense when we consider the track record of our incumbent lead-off hitter. I really think it's possible that the Reds signed Womack as insurance because Ryan P. Freel (as he is called on my CBS fantasy site) is a loose cannon. I mean, the Reds lineup is SO much better with that 40-steal threat at the top of the order. Lopez is dynamite out of the 2 spot, but not much at lead-off. Since Freel has a penchant for living recklessly, just like he plays, Womack makes more sense as an speedy and dependable (if patently unspectacular) veteran.
Don't get me wrong: I love Freel's intensity and commitment to sacrificing himself for the team. However, I'm not sure I'd really want to know him personally... or hang out with him off the field. I know he just got community service last time, but Freel clearly has a drinking problem and is a brawl waiting to happen (remember the run-in with D'Angelo Jimenez? Admittedly another prickley character, but it takes two to tangle). Combine this with his breakneck playing style, and there's not much likliehood Freel is going to play the whole year.
Though he doesn't do anything as well as Freel, Womack's intangibles as a veteran leader would be a good steadying force should disaster strike.
What the Reds have against William Bergolla's overall skills is another question, but he certainly lacks experience as a lead-off hitter. Perhaps that's the insurance they want. Just in case.