If you need an option beyond Outlook Web Access it’s still very easy using something like:
Set objUser = GetObject("LDAP://cn=myerken,ou=management,dc=fabrikam,dc=com")
objUser.ChangePassword "i5A2sj*!", "jl3R86df"
from the Users bit of the Script Repository at http://www.microsoft.com/technet/scriptcenter/scripts/ad/users/default.mspx?mfr=true
It would be trivial to embed this in an ASP script. I’d force the use of SSL though 🙂
JR