LGPL is for libraries so does not really apply. GPL is OK, but as per Ovi rules, then you yourself have to provide the sources somewhere in some form (if you publish simultaneously to the free maemo.org extras-devel, that should be enough). You could go for a dual-license setup (piggz public license for Ovi, GPL for extras), but this might not be an option if you integrated snippets from all over the web.

And of course, IANAL