I must admit the first two are not pleasing to my eyes to look at but does give the familiar look of a family of sites you are trying to go for.
Please if you use one of those gems keep us updated the LessCSS looks very promising as long as it gives the flexibility that it appears to offer w/o taking away some of the CSS you thought you actually programmed into a specific tag.
The one suggestion I can make is the idea of images in the tags (like how you have it for android on the site). It is much easier to scan for images then tag names if just going down the list on the home page.