While starting a web project, we usually use a set of resources like CSS-reset, various JS hacks for IE, etc. to overcome browser incompability issues.
HTML5 Reset is a project which aims to offer a base for the HTML5-CSS3 projects which covers these issues by default.

Besides the standard HTML tags, it has rules to reset the new tags like title, header, footer and JavaScript-powered fixes for IE.
The set comes in 2 versions:
- Bare Bones (stripped down to the essentials)
- Kitchen Sink (when we want the option to remove features, rather than add them)
Inside the download package, there is also a sample content provided to help you get started.
Mike Plate, a freelance web and mobile developer, has created an impressiveCSS3 Playground to help seeing the properties in action easily.
The web application enables you to style a box with a text (that can be resized and re-positioned) with the help of sliders and color-pickers.
Once the properties (like radius, box-shadow, CSS3 transforms, etc.) are updated the result is displayed instantly with the CSS code generated.

MyWebSql is a web-based and open source MySQL client that is built withPHP.
It has an Ajaxed interface and besides the rows of tables, it can control views, stored procedures, triggers and functions.

Data can be exported and imported easily (query results can be exported as well).
MyWebSql comes with a syntax highlighting rich-text SQL editor to run queries (the last-ran query is shown automatically which is a nice reminder).
The application is improved frequently and, within time, can become a good alternative to mature solutions.
Few days ago, the jQuery team announced that they are working on jQuery Mobile which will probably become quickly popular on creating mobile web apps. for the fans of the library.
On the other hand, there are already ready-to-use solutions like the pretty-complete jQuery iPhone UI (check the “Mobile Development” category for others).

It is a jQuery library which emulates the iPhone interface that is handy for creating iPhone web applications.
The library includes widgets like menu, tabs, scrolling, forms and gallery browsing.
jQuery iPhone UI is not complicated to use and comes with a documentationto get you started.