I personally think both picks were fantastic. I was hoping for CDR heading into the draft, but hearing Ainge and Chris Wallace (I know, I know) say that Giddens is just a better player set aside any concerns I had about that. And Walker is a project but could be a beast.
Also, the only addition I would like to see is a replacement for PJ. If Pollard can play a full year, fine. If not, another vet. Other than that, resign guys and one will be the odd man out in a few months - likely either TA, Pruitt or Cassell. I agree I think we bring Cassell back. I was in favor of him at first and defended him more than most, but even I recognize that he can't fit our system as is. But, let's face it, he jumped on our team 2/3 of the way through the season. That's not a lot of time for a point guard to get used to an offense. He had to just do what he's done his whole career. Some nights it was awful. Some nights it won us games, including playoff games. With a full offseason, preseason and regular season, I think he can learn the system much better and satisfy our backup PG needs.
If he can, we resign our FAs and we throw in a center, I think the team is basically complete. I mean look at how much we have:
Starting Point Guard: Rondo (1)
Starting Off Guard: Ray Allen (2)
Starting Small Forward: Pierce (3)
Starting Power Forward: KG (4)
Starting Center: Perk (5)
First Reserve - Wing: Posey (6)
First Reserve - Bigs: Powe (7)
Reserve Point Guard: Cassell (

Reserve Shooter: House (9)
Reserve Defensive Specialists: Posey, T Allen (10)
Reserve True Center: ?? (11)
Developing Young Players: Rondo, Perk, Powe, T Allen, Davis (12), Giddens (13), Pruitt (14), Walker (15)
Towel Waver: Scalabrine (16)
That's 16 guys, including one yet-to-be-signed true center who I'm guessing is just a 7 foot veteran who's been able to stay in the league, a Pollard/PJ/Ratliff type. But among those 16 guys, 8 are under 26. Not bad for a really old team.
Over the next two or so months, we will reach our first decision point since we have to get down to 15. If Pruitt's developing well, maybe we don't need Sam. If Pruitt is just not getting it and looks like he never will, maybe we cut him. If Pruitt looks promising, but not quite ready, we keep both. If TA is playing like he did ~18 months ago, we keep him. If he's not coming back and is getting worked by Giddens and Walker, we cut or trade him. If Walker's knee is worse than expected, maybe we cut him. If everybody's working out well, then maybe we explore buying out Scal's contract.
I think the OP was right. The team has what it takes to win championships, if we keep our parts, and just got two talented young players in the draft. [Edit: Forgot Powe and Davis contracts expire after 08-09.]
Everything's coming up Milhouse.