Laugh. Just so everyone knows:
1) Install Impserve and Nick's plugins.
2) Point impserve at your Calibre book directory
3) When you add books to calibre (Go into "E"dit details and add the IMP format as well)
In Calibre I store both RTF and IMP (And if it was there before epub). By saving the format I converted from in Calibre as well I am "future proofing" my library if in the future the EBW drops dead and I have to purchase something else.
As I launch impserve on startup whenever I need to add a new book to the device I plug it in click the online bookshelf and voila all the imp's stored in my calibre lib show up, this is much easier then messing with the Smart media card as I need to crawl under my desk for that.
The benifit of doing things this way (IMO) is you can use Calibre to store multiple formats and it's tagging / rating system so you can keep track of what you have read. I also on occassion use the Comments box in calibre for notes about the book as well as teh summery from ibndb.
This is under Vista. On my iBook I have calibre installed and because my library / database is stored on Dropbox I can access everything from the mac side as well. Everything works the same on the mac side of things for me with the exception of some conversion tools, but as I mentioned above I am mainly converting files "Offline".