ThemeFlood:

http://www.themeflood.com/

Disclaimer: The description in the Hover-boxes are not from me. I copied and pasted this from the developers site. This is also for all screenshots.
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    Media

     

    Recently updated, Media is a simple yet solid multipurpose theme. Elements like the header can be extensively customised to include your own images. Media features several theme width settings and sidebar options, making it easier to build a site around existing content. A couple of advanced features are included as standard, including support for 8 Extra Content containers, a search bar powered by RapidSearch (not included) and a date-time function.
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    Storm

     

    Storm is a brand new premium theme for RapidWeaver. The basic concept was to develop a theme with a vertical columned appearance. The actual content, sidebar and navigation columns all have equal heights and the theme is left aligned. Storm offers a theme which is both minimalist and contemporary in style, making it an ideal choice for a range of different projects. It puts a slightly different slant on theme design. A good range of powerful theme settings are built in, enabling easy theme customisation. Alongside options for a static background, Storm incorporates an optional sliding animated background using jQuery javascript. The theme also builds in support for smooth-scrolling anchor links, making this a perfect theme for creating single-page websites.
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    Composition

     

    This theme started out life as a humble free theme called Aperture, originally developed by Dary Barclay. Increased demand for more features and better compatibility saw a new 'pro' version released in 2008. Composition has continued to grow in popularity, thanks to its distinct 'light on dark' colour scheme, vivid header container and complete range of theme settings. Ideal for marketing, portfolio and photojournalism websites.
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    Wilderness

     

    A perfect RapidWeaver theme for creating professional websites. Wilderness gives you numerous customisable options and boasts excellent compatibility with a wide range of web browsers and third-party RapidWeaver plugins. This theme was originally introduced in October 2008, based along a similar colour scheme to the Sharp theme supplied with RapidWeaver. It has since grown into a popular third-party theme and a recent update sees many high-end features added. A wide range of both text and colour settings are included with the theme. Heavier modifications can be made including sidebar width and position, theme width and header container height. The header container itself has support for 40 custom images, on top of several example images supplied. 14 Extra Content containers are built in, alongside 7 logo image placement options.
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    Black & White

     

    Black & White boasts everything a minimalist theme should have - plenty of whitespace, maximum emphasis on content, easy navigation and an excellent selection of both style and colour options. Since its launch back in 2007, Black & White has become a popular theme with users looking to create professional-looking blogs, portfolios and home pages. A recent update introduces a swath of new features, which combine to make Black & White an even more desirable theme to own.
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    News Media

     

    Packed with professional features, giving you the power to develop stunning sites which are both flexible, well structured and highly functional for end users. News Media is ideal for content-heavy websites and has become a popular choice with independent publishers and entrepreneurial journalists. Key features include support for up to 10 levels of navigation, 15 Extra Content containers and a choice between single or double sidebar layouts. News Media also has a broad selection of theme colour settings and text styling options. Despite cramming so many features in, News Media remains a fast and nibble theme boasting excellent cross-browser compatibility.