[modernerd]

I use graze. Very impressed with the service, the value for money, and the site itself.

You vote on items they send and 'bin' the ones you don't like so that they don't offer them again. Over time, it builds up an index of the snacks you like, and becomes less hit and miss. I'm rarely sent stuff I don't like now (although I'm not a fussy eater).

The whole operation is very slick; the packets are designed to be nutritionally balanced -- you'll never get 4 packs of chocolate in one delivery, for example. The packages they send are robust and they fit through standard UK letterboxes, so you never have to go out and collect items, or worry about them being torn to shreds.