Once you installed the qt program (and probably other ones) bitcoin: automatically starts the program and inserts the address into the pay to field, making it easy to send. I think blockchain has a feature where you can set bitcoin: to go to your blockchain wallet.
Would be nice, wouldn't take any time to change, add a simple href tag. Replying to the post above mine, blockchain.info is a specific company, but I haven't used any other blockchain. Maybe a
bitcoin:15syp6mtPPqGAourRxgTJqnYyeAKHH6yiQ link would be nice also.
bitcoin: prefix indicates a protocol or something? I think that's interesting. I guess the idea would be that you set your browser to prefer what it wants to do with bitcoin: links kinda like mailto: links or something?
Yes it is exactly like a mailto: link