Yes, very much so.
Model kits - I've been getting my 10 year old into this because I got sick of him p*ssing his spare time away on a NDS. As a result I have started doing them again. Currently working on an Airfix 1:72 Mosquito XVI
Lego - when I was 10 I had the original Lego Space sets (the big spaceship 928 fetches 1500 quid in boxed condition now on places like Ebay), I loved them and kept them pristine, but my bloody mother gave them to my cousins when I went to Uni. My kids are now into the Star Wars stuff, and I love helping them build it all. Latest acquisition for my 7 year-olds birthday was the AT-AT from Empire Strikes Back. Absolutely brilliant.