As far as the 'Pop' thing goes, this is my opinion:
It depends on what the intention is. If the intention is to actually record new versions of the Pop songs, ala the Best Of 1990-2000, then I say don't waste the time. The production styles the band uses has changed so much in just the past eight years that the songs wouldn't sound anything like the originals.
However, if the intention is to take the original 97 'Pop' recordings and simply make modifications to what is already there and recorded, in the same they would if they were improving a track for single release, then I say go ahead and do it if you think you can do it without stripping 1997 from those songs. What I mean by that is, if you can make those songs even better than they already are but still leave them feeling like they're from 1997, from the 'Pop' album, do it. But if those songs are going to feel like they're 2005 re-makes when you're done with them, don't bother.
That said, I don't think the songs on Pop need any improvement. Except that I'd love to see a version of 'Please' that is the album version with the guitar solo added in, since aside from the solo the single version is inferior in every way.