It possible to use the msid in the link to a map at maps.google.com, see:

{mosmap msid='108595336348435880749.00044a946bcb3d5f61664'}

You can find the MSID at maps.google.com by clicking on link and copy the value of the paramater MSID in the given url.

Also better support for the links generated by maps.google.com:

{mosmap kml='http://maps.google.com/maps?f=d&hl=pt-BR&geocode=
&addr=S%C3%A3o+Paulo,+Brazil
&daddr=-23.074678,-46.358185+to:Joan%C3%B3polis,+Brazil
&mra=dpe&mrcr=0&mrsp=1&sz=10&via=1&sll=-23.21342,-46.45761
&sspn=0.574262,0.85144&ie=UTF8&ll=-23.190863,-46.470795
&spn=1.148712,1.702881&z=9&oe=UTF8&output=kml'}