Photoshop will of course work, but it's not the only way. I use Fireworks for stuff like that, because that's what I have and use for other things anyway, but I wouldn't recommend getting it just for something like that. I'm not sure what free programs other than Gimp would do it. There must be something out there that's lighter weight that can do it for free. I normally recommend ImageWell for resizing and cropping and stuff, but I don't think it can blur. However, it will allow you to put blocks or other shapes over certain parts of the image, which is just as effective as blurring. ImageWell is great, it's very lightweight and it's free.