There will be a huge jump in the level of implementation of SVG filters between 0.45 and 0.46. One of the big steps was the introduction of the “Filter Effects” dialog box. This allows you to create a custom filter effect out of a combination of 1 or more filters.

The example in this screencast is just a simple drop-shadow filter effect. In it i use the Offset filter and the Gaussian Blur filter.

For a more about this new feature check out the release notes in the inkscape wiki or check out the special filter effects section in the wiki

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