I think most of the things we've done are covered here but can only echo
Try the supermarket value stuff. We use Sainsbury's basics and there's quite a few things where I wouldn't go back to the pricier stuff - and I wasn't even a 'brand' person to start with. We use the grated mozarella for homemade pizza, and a hard parmesan type cheese for sprinkling on pasta. 30p basics chocolate (dark and milk) is great for baking with.
We go to Aldi probably once every 2 months and it helps that there's one in walking distance from where my parents live so no extra fuel to get there. I only use their washing detergent now and pick up cereal, marmalade, jam and other bits and pieces. You need a good idea of the price of stuff in Sainsburys etc tho to be sure it's a bargain. Also you'll wipe out any savings if tempted by the 'random stuff' - compressor anyone?!
I do the regular weekly shop online and think I'm less tempted to buy rubbish as it isn't so easy to browse. You can also get up and check the cupboards mid-shop.
Been doing packed lunches for DH and I for years - saves a load.
Lots of soup in this house - normally referred to as 'bottom of the fridge' soup. Contains the tired stuff from the veggie drawer - usually heavily features carrots - but cheap and tasty. I don't have a recipe really - fry some onion, dried herbs add whatever veg I've got and stock made from Bouillon powder. Great in the winter. I used 3 10p leeks from M&S a few weeks ago.
We stopped pay TV a couple of years back - shocked by how much we spent and how little we watched. We only have free-to-air now and a Lovefilm subscription (£6 a month) which gets us more movies etc than we ever have time to watch. Don't miss the pay stuff at all.
Good luck and once you get into it it actually becomes quite rewarding.