Thought I'd check on the progress of the tunnelling machines that started out across the road last year. According to the Crossrail site they've made good progress, have gone from here to Paddington, then under Hyde park and into the West End, and are both just coming up to Regent Street.
http://www.crossrail.co.uk/route/near-you#.UYYfoEaL7TM then enter the station as Paddington.
This is pretty good going, hope they can keep up this pace and get the stations etc. built on time to meet the planned opening in 2018.