Making ricotta* today, the simplest of all cheeses IMO. No special equipment required apart from a pot and a thermometer.
Pour 4L of milk into a large pot and add a teaspoon of salt. Dissolve a teaspoon of citric acid (it's in the baking section of your local supermarket) in a few tablespoons of water and add that to the milk. Heat the milk to around 90*C, stirring occasionally to prevent it from sticking to the bottom of the pot and creating more mess to clean up. As it heats, you'll notice that curds start to form at the surface of the milk, but the milk remains, well, 'milky' coloured. As it gets to between about 85*C and 90*C, you'll notice that the curds really separate from the whey and the whey loses its milkiness, turning watery.
Don't heat the milk over 90*C or you'll end up with burnt tasting ricotta. If the milk has reached temperature and hasn't spilt cleanly into curds and whey, you can try adding a tablespoon of vinegar and stirring it through to see if that helps. Too much vinegar and the ricotta will start tasting acidic, but 1 or 2 tablspoons shouldn't be an issue.
After the milk has separated into curds and whey, ladle the curds into a cheesecloth lined strainer, tie knots in the corners of the cheesecloth, and hang over a sink or a bowl to drain for half an hour. If you don't have cheesecloth, a chux wipe does just as well.
4L of milk should yield just over 1kg of cheese, dependant on the brand of milk and how well the curds form.
Spinach and ricotta canneloni tomorrow night for dinner
* I should point out that this is cheats ricotta. Ricotta is normally made from leftover whey from the cheesemaking process, but this is madee from whole milk. It has a better yield, but isn't the way normal ricotta is made.