If you're visiting my adopted city of Madrid, you can find all the posts I've written about it here.
If you're looking for details of top sights, restaurants and my favourite places in the Spanish capital, check out the Madrid Monday series here. Another great site for finding restaurants and cafés in the capital is Naked Madrid.
If you have time for a day trip, you'll find posts about those that I've taken here.
For those on a budget, I'd recommend making the most of the free opening times at the city's many monuments and museums. You can find out all about these here. You can see all my budget posts here.
For more little recommendations, particularly my favourite places to eat and drink, you can find all my tips on Foursquare @ohhellospain.
If it's your first time visiting Madrid (or even Spain) and you want to learn more about Spanish cuisine and Madrid's history at the same time, I suggest you try one of the Madrid Food Tours soon after you arrive. You can read about my experience here.
And after having a browse, if you still have any questions about Madrid, feel free to get in touch!