Static electricity - like when you put your nose up to a CRT or an old TV after it's been turned off, and the air is all ionized. I don't know if that counts as a smell or not.
New plastic toys
A new RC car that drains 8 alkaline batteries at once, being driven at full speed for over 10 minutes. The smell of electricity, basically.
When a girl comes out of the shower and has shampooed her hair, but hasn't put on any other perfume yet.
Old books
The plasticy-dusty smell you might notice when you are desperately blowing into an old NES to make it work.
Chlorinated swimming pool
Freshly-ground hazelnut coffee
New guitar strings
Fruit loops and / or leather polish. It's basically the same smell.
(al)
