The 2012 website has a host of cameras all around the olympic site. You can watch the venues grow over time from them.

Stop frame photography allows you to watch the progress made since last summer (be patient there's a lot of info being downloaded) and it is really very impressive how quickly things are taking shape.

There are currently two designated cameras following the aquatics Centre's progress.

They can be accessed by going to: 

http://www.london2012.com/plans/olympic-park/webcams/aquatics-centre.php

and

http://www.london2012.com/plans/olympic-park/webcams/aquatics-centre-close-up.php

the general page for viewing all such cameras can be accessed by going to

http://www.london2012.com/plans/olympic-park/webcams/index.php