Intraweb + Kylix experience ?
I must create an high performance web application at work.
For High performance + RAD, go with ASPX. Its slightly quirky, but it can scale really well (plug-n-play additional application servers), and its really quick to develop some basic stuff. If your a c++, perl, or Java programmer, C# will seem pretty familiar, and if not, you can always WRITE aspx in perl or java. :-)
Mentioning Kylix means that you want to use Linux, so ASP.net (i.e. .aspx is not an option yet). I prefer the .NET way but for Linux Intraweb + Kylix will work for you just perfect.
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