John Siracusa's review of Mac OS X 10.7 Lion for Ars Technica is, in my opinion, the must-read review for anyone that's even remotely interested in the new operating system by Apple. It's extremely detailed and John Siracusa is someone who's opinion I trust.
The review is huge. Hundred's of pages huge. 27,000 words huge. And it's awesome.
You can read it at Ars Technica for free from the link above, but it's such a good review that it will no doubt be a great ongoing reference. I think it's worth getting it as a Kindle eBook to read in a friendlier format and have it there whenever you want to look something up. Plus, you support the author. And it's only US$4.99.