Programming Languages and their effect on SEO
All sites are built on programming languages. It’s the language of web creation. Good site SEO starts in the design phase, and the programming language selection is part of that phase.
JavaScript / Not very search engine friendly. It’s a best practice to include external JavaScripts at the bottom of the page, in order to ensure the search engine ‘reads’ the important parts of the page. Also, search engines don’t index content in JavaScript optimally, so if you have any links in the JavaScript, they will not be indexed as well.
Flash / A SEO nightmare. There have been a few strides in being able to index content in Flash files, but in general, make sure the content is in HTML code also.
Adobe has launched a SEO Tech Center at http://www.adobe.com/devnet/seo/. It includes quite a few current resources for Flash and SEO. Right now only Google and Yahoo is indexing the optimized Flash files.
ASP and PHP / Could be good to go! These are programming languages to build applications, and depending on the architecture, they can be very SEO friendly. The most important thing is to remember each page of content needs to have a seperate URL.