Yes, bloggers should be protected. Plenty of things in the legal system already call for discretion, and I think it should be pretty easy for a judge to decide whether or not someone was legitimately acting as a journalist. But bloggers should definitely get the same protection as any other journalist.
The Gizmodo case is interesting to me for a couple of reasons. I think Chen himself should be protected from legal repercussions, because the dude was just doing his job and probably just being a good journalist. I know I've railed against Gizmodo elsewhere on these boards for this, but I wanna be clear: Chen himself should be protected.
Gizmodo/Gawker's management/ownership, on the other hand, should not be protected if they knew they were buying property from someone who didn't own that property and decided to go ahead with it anyway, especially if they advised/compelled Chen to go through with it. I'm not saying they should be prosecuted, either, but going "Woah, shield law!" if you've decided to break the law yourself doesn't seem cool to me.
The other thing that's interesting: According to a story on Wired that quoted someone from the EFF, journalists are protected from direct search and seizure even if they themselves are being investigated for a crime. That doesn't mean they can't be compelled to hand stuff over: According to the source, the proper legal method would have been to subpoena the journalist/publication, allowing them to appeal the action and sort out materials relevant to the inquiry from stuff that would be specifically protected/unrelated to the subpoena.
That sounds pretty fair to me, and it sounds like they done ****ed up by executing a simple warrant and just going in and seizing stuff.