PSA guys, technically this isn't any more secure than encrypting your own wallet. If a hacker/malware were on your system and found the "secret" link in your browser bookmarks or saved somewhere on your system, the hacker could just use that URL to transfer the funds to their own wallet.
Yeah, it's one more thing for the writers of malware to have to search for the secret link, but it's not out of question. Look at all the hacks and stuff that have come up. WHere there are security holes these hackers will find a way to get in and steal stuff. It didn't take them long at all to make the malware to steal wallet.dat. The level of effort it would take to adapt that malware to also search for this secret URL is trivial.
Or am I missing something?
You could encrypt the bookmark link to your instawallet ... or continually create new ones and move the money around ... get creative.
And I don't think anyone ever said it was for large holdings just your spending money when you are out and about on the net .... so you don't have to fire up the big kahuna with your savings wallet in it just to buy some socks and blow ....