Typoscript is the configuration language of the CMS TYPO3. Since Typoscript is very powerful and widely used in TYPO3 based projects syntax highlighting and code completion will help to speed up development of TYPO3 projects.
TYPO3 includes a system extension called t3editor which already offers syntax highlighting inside the TYPO3 backend. See http://git.typo3.org/TYPO3v4/Core.git?a=tree;f=typo3/sysext/t3editor;hb=HEAD for more information.
Since a few days a Netbeans plugin which supports Typoscript syntax highlighting and code completion exists as well and might be useful as a reference. See https://github.com/dfranek/Netbeans-TypoScript for more information.
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