I'll likely buy a second 40D and grip. That way I'll get a second charger and battery.
Other stuff:
1. A handful of faster 2GB CF cards (120x/133x or better).
2. More eBay BP511s (four for $24, incl shipping, last time I bought em).
3. Tokina 12-24/4, unless I hit the Lotto, then a 14/2.8L II.
4. Handstrap E1s for both cameras.
5. One precision matte focus screen to try out, another if I like it.
6. Kirk or Wimberley QR plates for the bottom of the BG-E2s.
7. A nice, fresh, new sensor cleaning kit.
"also where is a good place to find lens hoods?" On every single one of my lenses 
Online, try www.KEH.com
and eBay. Also, check if there is a used camera store in your area. One in mine is the best source of small items like that. Finally, if you have a camera equip show or swap meet, that can be a good place.