WOW! I just found out that Hitachi is now offering a 10 year warranty on their HXP Lithium Ion Tools!!! And it's retroactive to tools bought in 2006

I've got a lot of Hitachi tools and that's what we mostly use. It looks like we're in good shape for while, especially since we supplemented our Hitachi cordless power tools with some Milwaukee, some DeWALT, etc. Here's the link with more info about the new 10 year warranty that covers most of the cordless HXP power tools. HXP batteries still have a 2 year warranty.
http://www.lowesforpros.com/sites/default/files/PR_Hitachi_Announces_10Yr_LI_Warranty_1[1]%203-13-09.pdf