Since S60 does not support Java ME higer profiles (CDC/Personal Profile for example)
and Nokia seems to have forgotten about the availability of eRCP for S60 (that is being developed as is stated on the project website, but it is being developed since forever, it is almost a vaporware).
The Microsoft guis took it ahead and the long-time awaited .NET Compact Framework 1.0 for Nokia Symbian S60 smartphones has been released by Red Five Labs, with a no-royalties runtime.
The significance of this release is hard to deny, as it may bring more applications and developers to the S60 platform, which is known for its complexity. Furthermore, this may bring many of the existing Windows Mobile applications to the Nokia smartphones.
David Beers on its blog, Software Everywhere, has more information on the subject.