Meanwhile, I found a link to great IDE in Aptana (in beta) on Robin Debreuil's weblog; from the product page:
I've been using it for a few days now, and it is actually quite solid; it is built on Eclipse (and has a plugin for it) plus it's available on Mac, Linux and PC. If you are doing some coding in the file formats mentioned above, you want to try this product.
-- eokyere :)
Aptana - http://aptana.com