Key features:
Category specific ad fields - you can have property, automotive, personals, employment categories and more, all in one package !
Powerful modules system - you pay only for the features you need.
Search engines friendliness (search engine friendly URLs support using mod_rewrite).
Multiple payment gateways support (you can accept credit cards, Paypal, checks, cash orders, wire transfers at once).
Major payment gateways built-in for automated payments processing (Authorize.Net, Paypal, 2Checkout, Worldpay), others can be added.
Ability to charge for listing placements (category specific pricing supported), for listing extra options (Priority Ranking, Extra Visibility, Featuring) and for membership.
Ability to have private sellers (posters) who pay per listing and dealers who pay monthly and can add as many listings as you allow.
Possibility to generate static HTML content.
Advanced DB queries caching system.
100% template based layout + language file allows website translation into any language and full control of design elements.
Custom ad field types (text boxes, menus, checkboxes, radiobuttons, unlimited images, files to upload, etc.).
Bad / long words filtering, automated expiration notifications.
Outstanding performance and scalability, unlimited sotfware usage scope.