I get this on V-strom too on occasion. More of feature than a fault as such, can possibly be overcome by use of the clutch or being in 1st before you reach a stop, as others have suggested. Most bikes I've owned have had a bit of clunk at very least when shifting into first from neutral, especially when hot.
Been reading a bit more on this, it is indeed a common feature of many bikes! One of many such "clunk" threads I've found on the matter:
eg:
http://www.thumpertalk.com/forum/archive/index.php/t-676351.html
There seems to be many theories on a solution: fresh synthetic oil (obviously not an issue with a new CBR), not babying your gear changes, not releasing the clutch when in neutral for a short time, reducing the idle speed to minimum. Lots of ideas out there, most pointing to this probably not being a fault, more of a design feature that can be solved by altering your gear engagement / clutch technique. I'll experiment with a few of the suggestions on my V-strom and see if there a definitive answer for me. I'm sure in my bikes case (clutch properly adjusted with newish oil) it's something to do with the gearbox still spinning internally as I try to shift from neutral to first.
In summary I think the people who aren't having this problem are just doing things right (naturally or by accident) and the rest of us need to experiment a bit more, once you've eliminated the obvious like the clutch cable having too much free play (the first thing you should check).