It is mostly challenging to build table-less, semantic forms that look good & work cross-browser.

RMSforms is a CSS framework for making this process easier.

Considering forms are a list of elements, the framework uses unordered lists for grouping items & style them accordingly.

The layout of the forms & how labels are displayed can be set to be horizontal or vertical by simply updating CSS classes used.

The demo shows outputs of multiple combinations to better see what can be accomplished with RMSforms CSS framework.

SemanticHacker is a free API for creating meaning based search queries rather than the keyword based ones.

From Wikipedia: Rather than use ranking algorithms such as Google’s PageRank to predict relevancy, Semantic Search uses semantics, or the science of meaning in language to produce highly relevant search results. In most cases, the goal is to deliver the information queried by a user rather than have a user sort through a list of loosely related keyword results.

Although semantic search may seem experimental, there are already successful projects like Hakia (doesn’t use this API) which is a semantic search engine.

Using the SemanticHacker API, you can analyze a content, get a categorization for it & can present other content (like related items in Wikipedia or Amazon.com) & more.

Using Uni-Form, which is a standards-based form template, even web users with only basic knowledge of these technologies can get nice looking, well structured, highly customizable, semantic, accessible and usable forms.

Users can choose between most common form layouts by simply assigning a css class to the fieldset element in order to get a different layout of the form controls your design requires.

Within the Uni-Form community, there are some extensions built too, like a Prototype one.