OpenBook offers many features, so here’s a quick list:

Magazine-style homepage, including 2 columns and SmoothGallery for your featured posts.
100% Gravatar compatible.
3 availables custom fields to insert images on the homepage featured gallery, on homepage posts and categories posts.
Magazine-style dropdown-menu for your categories.
Not manual editing of files required. OpenBook have a special tab in wordpress [...]

Popularity: 11% [?]

Here some three Columns wordpress themes that maybe you like.
1. Amazing Grace

Amazing Grace is a lightweight, super-optimized WordPress theme packed with features (SEO, Adsense & Widget Ready). Brought to you by Vladimir Prelovac
2. Adept

Adept is a versatile theme with a custom theme admin page to set colors, add your contact info and analytics tracking [...]

Popularity: 11% [?]

Technoholis theme was came with two version (free and premium).
with the free themes some features will be disable but u can still use for your blog anyway thats if u like it. If you want more features, you can upgrade to the premium theme for USD18 only. So what’s the difference between the two versions?
Popularity: [...]

Popularity: 19% [?]

Corpo Geek is a free Adsense ready with advertising blocks WordPress theme. This theme is best suitable for those bloggers who want to maximize their online revenues through ads.
Corpo Geek features:

2 columns
Adsense ready spot
4 125×125 advertising spots
valid xhtml and css codes
utilizes a 960 grid system by Nathan Smith
clean design
[...]

Popularity: 29% [?]

Popularity: 32% [?]

Popularity: 32% [?]

Impress Wordpress themes from Themebin with 3 columns, Right Sidebar, AdSense Ready, Minimalistic, White, Black, Gray, Fixed Width, Widget Ready.

Download: Impress Wordpress Theme
Demo: Impress Wordpress Theme
Enjoy
Popularity: 22% [?]

Popularity: 22% [?]

WordpressThemed is proud to release free wordpress theme: WP Corporate Branding.
Screenshot:

Features:

3-column wordpress theme
company wordpress theme
valid XHTML and CSS
widget ready
works with latest Wordpress 2.5.1 and Wordpress 2.3
backward compatible with Wordpress 2.2

Download:
Live Demo | WP Corporate Branding
License:
Attribution Share-Alike

Popularity: 17% [?]

Popularity: 17% [?]

WordpressThemed is proud to release free wordpress theme: WP Hosting Web 2.0.
Screenshot:

Features:

3-column wordpress theme
hosting wordpress theme
valid XHTML and CSS
widget ready
works with latest Wordpress 2.5.1 and Wordpress 2.3
backward compatible with Wordpress 2.2

Download:
Live Demo | WP Hosting Web 2.0
Popularity: 20% [?]

Popularity: 20% [?]

Personal is a blue, 3-column WordPress theme with two widget-ready sidebars, custom templates, a banner switcher, custom text styles, integrated plugins, and a unique way to display entry dates and comment-number links. You can preview it here. It’s compatible with WordPress 2.3 and has been tested with in Firefox, Internet Explorer 6, Opera, and Safari.
Features

banner [...]

Popularity: 17% [?]