Well, we should only resort to using Java if a Tcl alternative is not available or achievable, IMHO.
SOAP is already available for Tcl. There's no reason to use nsjava for SOAP in OpenACS unless you already have some Java app that you need to talk to or something of that sort.
WebDAV seems like is very close with the VFS extension for Tcl 8.4 (see http://mini.net/tcl/2466 and http://sourceforge.net/projects/tclvfs/). You already *can* mount WebDAV shares with Tcl VFS (see http://mini.net/tcl/3203 for an example of using Tcl VFS to mount Apple iDisk shares, which are webDAV shares).
While nsjava is exciting and great, we should focus on our core technologies and use Java and something available through nsjava when Tcl is not there yet (or for compatibility/interoperabilty) and even so, we should make efforts to help with Tcl equivalents.
