fear not, oh intrepid internet explorer, there is a plugin. simply install the flickr quicksilver plugin plugin page then select the pic you want to upload in quicksilver by navigating to the file just the way you normally would. hit the tab key then look for your new flickr action and hit return.
first time out, flickr will ask for your permission to let quicksilver upload but after that it's plain sailing.
now isn't that cool? i knew you would love it.