I am just getting back into chess after some time and I am slowly getting back to where I was. This time about I have started playing d4 as well. I have not settled on many lines other than major opening choices but I do play the QG and this is something I am considering. I have noticed some strong players who use the exchange variation and it certainly seems to do well. I need to devote some time looking at it and see if I think it suits me. I think it is very interesting. I am mostly a positional player and when I stick to that, I seem to do my best.
Queens Gambit - Kasparov Line
This Variation is also known as the Karlsbad variation.
Its a flexible variation where you hold off placing your kings knight and you can decide on your plans when you place your knight.
The other option for the Karlsbad is to play Nf3 followed by Rael to go for a kingside attack (through Ne5 g4 and then swing the queen to g2) or play Rab1 to go for a minority attack on the Queenside. Of late the latter this has been my preferred option.

thank you very much trent...I have seen people use that Nf3 variation you said against the Slav & Variable I am sure you will enjoy playing this line if you decide to opt for it.
I play the line with the minority attack quite alot.
I had a bit of coaching with Serbian GM Dejan Antic whilst he was in Australia a while back. He taught me the principles behind the Karlsbad variation.
Because it is flexible your opponent will not know how the game will continue. One time you might go for the minority attack.. the next time the K side attack.
I play d4 and as you can imagine this brings a lot of queen's gambits games and I like to play a line off the classical line which is all about controlling the centre and trying to open up files, diagonals etc...
I am not an amazingly strong player but I am a maker of chess puzzles so I hope you will find this reasonbly easy to follow! I will now insert the main line of this opening into a board so you can look through it and hopefully you wil have some comments (bad or good) and I will be able to answer.
Watch out for the move f3 because that is what characterises this opening! Also, as I am sure you have guessed this opening was used reguarly by Kasparov and he recommended it very highly so I would consider it very seriously...hope you enjoy this and please leave your comments.