Martin,
I know you've just spent a lot of money on a toy that isn't there yet... but you might want to consider getting an eBookwise 1150 while you wait. They are only US$140, and while they don't have the beautiful e-ink screen, they do read nearly everything except PDF (with some conversion software) and they have a backlight, which is convenient for reading at night in bed. Then your wife can use it after your iLiad gets there.
(And you can convert many PDF files with PDFtoHTML -- or see the excellent site
http://processtext.com for more conversion utilities.)