I would just like to add that these transposition are all in NCO. It is an important point to make as the transpositions you give should be valid and not nonsensical.
Transpositions.

The idea of forcing e6-e5 via Bf4 is totally new for me. Thank you very much.
What is NCO?
The Bf4 idea followed by ...e6-e5 is a quite common path to reach the Sveshnikov actually!
NCO stands for Nunns Chess Openings. http://www.amazon.com/Nunns-Chess-Openings-Everyman/dp/1857442210
I would like to know what are your favourite transpositions? Or which ones do you hate coming up against?
I think that transpositions give chess a whole new element and make the game even more difficult and exciting. Do you like transpositions or dread them?
Here are three that I like... you probably know them. If you don't have any comments to make but want to share some transposition with us please post them. (Rule: Please post the 2 (or more!?) ways of reaching the same position so people know what your talking about. Please click ''Move List'')
The first transposition is a rather popular one and may seem quite simple. In each move order we arrive at the Sveshnikov variation of the Sicilian defence. We see that this can be achieved after various Black second moves. The reason I like this one is because it makes one think a little deeper about opening preparation.
Something probably a little more interesting is this following transposition. The game begins looking rather like the Alekhine's defence but ends up as a Scandinavian! Very interesting to say the least.
This third example is a transposition from a line in the Dragon to a line in the Najdorf. Exciting stuff. (There are probably lots and lots more Sicilian transpositions if one is to look for them.)