Yep, you do need a banner and a custom logo.
The site needs generally a bit more action, flash movies and/or animated phones where users can get a 3D view of a phone, the view should ideally be able to rotate.
Take the categories from the skyscraper side bar and move them horizontally under the banner, mold them into buttons and start getting some comments on each phone.
Get some level of backdrop image, the site is too unspectacular at this time. Deliver some action, be as innovative as the phones you're blogging about.
Other than that, the site itself is pretty straight forward. :tu: