Forum Nokia are examining the Javascript extension, Ajax, used in many 'active' webpages to create desktop-like applications, for use in the S60 v3 browser (reports The Register). Two years ago, Nokia looked at using Python in S60. Four years before that they were part of the decision to open source OPL for S60 and S80.
Read on in the full article.
To be honest I think Opera have done all the innovative work here - the Opera Platform stuff is well worth checking out.
What might be more interesting if there were tools / support from Nokia for enabling this sort of thing with more handset integration... Maybe they should just ask opera to do it for them!
I think it's worth mentioning that S60 browser (the new one) supports AJAX _today_ in all 3rd Edition devices.