Many of the swag ideas shared are fantastic. To go one step further, I suggest co-branded swag:
I love my Marketo drink bottles and fitbit - I always like to see things I'm actually going to use. So +1000 to socks, laptop sleeves and munchkin plushies
Yes yes yes to coffee cups and/or any other kinds of beverage holders in general.
Laptop sleeve will be so cool
Plushies
Laptop Stickers
Caps
Thick Ringbound note oads
Good quality pens
Caps (U.K.) being ball caps?
I'm using a travel mug from my previous company. A Marketo one would be much welcomed.
Regarding the call for laptop stickers, I would seriously recommend vinyl decal that can be removed and reused.
Gift cards to Amazon
Munchkin plushie
Clothes
Socks - I want a pair of those
I second this! Love branded apparel - hoodies, socks, scarves, etc
Insulated water bottle
Hoodie
Plush Munchkin