I don't think I would ever rebrand my blog unless I had a mind-blowing idea.
There are high chances you can loose readers.
Best thing is to write a post on the old blog about it, and mail your friends.
What do you think are the advantages and disadvantages of rebranding your blog? I think an advantage is you get to have more of the image you originally intended, but you could lose readers along the way. It's important to have a lot of trust in your readers if you want to make a major change!
So what do you think?
Rebranding is a good way of getting a dead blog/forum back up again.
Eye Of The Tiger