Alessandro Furieri announced the availability of the beta of SpatiaLite 3.0.0 on 17 August. It can be downloaded here: http://www.gaia-gis.it/spatialite-3.0.0-BETA/index.html.
Some of the more interesting additions include additional support for topology and the ability to export GeoJSON.
I did a very quick test with QGIS 1.7.0 and was able to directly access and edit a table in a database I created with SpatiaLite 3.0.0 so that’s initially promising.
