Just look at this chart for reference, its an ideal example.
I just noticed that Newegg's comparison charts aren't perfect. This I find disturbing. Newegg should add checkboxes right next to the "remove" icon. This should allow users to check multiple items so that they may remove more than one item in a single page load. I honestly really like removing one then waiting for the page to load over and over again, but I fear newegg may want to conserve CPU cycles and bandwidth.
Same checkbox rules should apply to the rows of specs, too. I would really love to take Item#, Model#, Brand, Part#, Operating System, Optical Drive, Card slot, Wide Screen Support (no seriously?), Optical Drive Interface, and Modem off the chart in one pageload. It'll make comparisons easier. Users won't have to scroll up to see which ones has the 4GB AND 9600M, they couldd remove rows for common and/or ilrelevant features, etc. Just make sure you have a box at the bottum to restore rows. A "hide" button might work better for rows.
Also, an "Add Item#" box would be nice. Just a box to manually add product N82E16834152073 to chart would be great. I don't really like butchering URLs just to add a laptop I missed.