I have rarely found any websites that are very useful for showing soccer line movements. Although, I believe I did find a website a long time ago that was in Chinese and it was too hard for me to decipher. I usually just look for sites that have the opening/current lines. There is one app for the iphone that I like called betscores. It has info for all the major sports as well as soccer(including world cup play) and tennis. It has up to the minute odds updates from all the online sportsbooks. Anyway, hope this helps!
If you eventually come across any website that shows soccer line movements I would appreciate it if you pass it along. Thanks.