I guess the general thing is that the much anticipated high demand is higher than anticipated.
Most places seem to be working on first come first served. So not guaranteed even if you have pre-ordered.
Vodafone I believe have a delay.
Three state expected deliver on the 3rd May same as Clove Technology.
Amazon UK don't even have a price now and state in a box that are experiencing delays (so my Monday/Tuesday guess has been blown out the water)
US carriers also have delays with many reports spread over the internet.
If you are 1 of the lucky ones, then congrats to you. However I can see a few disappointed people, and a large grin from HTC/Apple