For those that think they will be moving to LR in the future, I have come across this neat little App, built from the ground up since the news of the demise of Aperture , and could be worth keeping a eye on it. I’ll try it out on a couple of small Libraries when I have the time, but i’ll leave it here and the decision up too you :)

You can download it from the MAS for $14.99USD or $18.99AUD and could take away a lot of headache caused by doing the move manually.

http://apertureexporter.com

And read up on it here :

http://www.ct-digiphoto.com/aperture-exporter-move-library-lightroom/