Webdesign

Sitemaps are an easy way for webmasters to inform search engines about pages on their sites that are available for crawling. In its simplest form, a Sitemap is an XML file that lists URLs for a site along with additional metadata about each URL (when it was last updated, how often it usually changes, and how important it is, relative to other URLs in the site) so that search engines can more intelligently crawl the site.

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Sitemap 0.90 is offered under the terms of the Attribution-ShareAlike Creative Commons License and has wide adoption, including support from Google, Yahoo!, and Microsoft.

BackTrack is a live CD Linux distribution that focuses on penetration testing. A merger of two older security-related distros -- Whax and Auditor Security Collection -- BackTrack bundles more than 300 security tools.

A few lines of PHP code including in your css stylesheet will automatically handle the compression of CSS files.

There is also a way of gzipping the CSS file for a better compression?

Lightbox JS
http://www.huddletogether.com/projects/lightbox2/
Lightbox JS is a simple, unobtrusive script used to overlay images on the current page. It's a snap to setup and works on all modern browsers.

Slimbox, the ultimate lightweight Lightbox clone
http://www.digitalia.be/software/slimbox/
Slimbox is a 7kb visual clone of the popular Lightbox JS. It was designed to be small, efficient, more convenient and 100% compatible with the original Lightbox v2.

ThickBox
http://jquery.com/demo/thickbox/
ThickBox is a webpage UI dialog widget written in JavaScript on top of the jQuery library. Its function is to show a single image, multiple images, inline content, iframed content, or content served through AJAX in a hybrid modal

Interface Imagebox
http://interface.eyecon.ro/demos/imagebox.html
Interface Imagebox opens an imagein in a new window, such as Lightbox JS.

modalContent
Use a div or any other content to create a modal content area on your page. This can be the basis of lightbox and other boxes that disable a page and present content over it. Very light weight.

Nifty Corners
http://www.html.it/articoli/niftycube/index.html
Basically, Nifty Corners are a solution based on CSS and Javascript to get rounded corners without images

Spiffy Corners
http://www.spiffycorners.com/
Spiffy Corners is a simple way to generate the CSS and HTML you need to create anti-aliased corners without using images or javascript.

curvyCorners
http://www.curvycorners.net/
curvyCorners is a free JavaScript program that will create on-the-fly rounded corners for any HTML DIV element, that look as good as any graphically created corners.

Round corners with jQuery
http://www.talrasha.com/jquery/curvycorners/demo.html
http://www.malsup.com/jquery/corner/

Other links:
http://www.roundedcornr.com/
http://css-discuss.incutio.com/?page=RoundedCorners
http://www.schillmania.com/content/projects/even-more-rounded-corners/