So sad that the very first files with the well-known Bitcoin logo are already absent. Today is a birthday of the logo, and I came here to check whether they are still available or not. Unfortunately, they aren’t.
Bitcoin logo files are not absent since they are public domain and available everywhere for free.
I think there is a problem with many hosting providers that are deleting old files or not allowing usage on bitcointalk forum, like ImageShack.
bitboy did a great job with Bitcoin logo, it is simple but easily recognized everywhere, something like Nike and similar famous logos.