Recently I've noticed that Google Maps have increased their usability of their already incredible maps service, offering real street images for the majority of the streets in Barcelona. This feature is shared with other cities in Spain such as Valencia, Seville and Madrid.
As well as the hybrid or aerial views from the normal maps, the new feature allows you to pin point a little yellow man, and then literally "view" the street from this perspective, and actually move around. The images are very up to date (see below, the scaffolding on Las Ramblas is still up). Considering that many people are using mobile telephones or devices that can display fairly large images on screen, this makes for an even better companion that a simple GPS, as you can even see the horizontal viewpoint of where you are going, and mark landmarks along the way, in case you get lost, or miss a turning!
For more information on the Barcelona image above, see this Las Ramblas Barcelona Guide.
Also see Cheap Barcelona Apartments for your stay in the city next time you're here!