The weird thing is that in spite of the news everywhere being that Mozilla/Firefox is gaining ground and IE is losing ground that I see IE regaining a bit of ground since January on my own sites (58% in January, 61% today).
Individual site mileage may vary. Areas of the world may vary. For example, some countries in Europe have 50% Firefox usage. I have one ecommerce site with very high IE6 usage because one of their main customers is one of those stupid large corporations that's fallen with Microsoft software and can't get up.