Here is a website with a new London tube map that tries to retain the clarity of the original London Underground map created by Harry Beck but incorporating more accurate geographical information. I must say I like it (for example I really like the depiction of the Thames - the Beck rendition misses the beautiful sweep and meander of this great river).
For example, I very regularly take the same route from Euston to Temple via Embankment. The old map tells you where you are within the London Underground Universe BUT not where you are within the Real-World Universe; is Temple North or South of Embankment? How far East is Temple from Euston?
A comparison is shown below.