I’ve heard a few folks looking for a way to create filled in text or shapes when using markers in their Cricut machine. Normally when you cut or draw letters, you get the outline of the font, with open space in the middle. In this Video Tutorial (sorry pre-youtube video site no longer active, but steps are to simply overlay screen over path and choose Path>Intersection) I’ll show you how to apply a screen pattern to the text in Inkscape so that it will fill in with your Cricut markers.
A couple of things to remember
1. Do not try to cut files you make this way, they are for markers only.
2. The size of the screen pattern should not be changed, so work in actual size and import into SCAL at that same size.
3. This takes a very long time to finish marking on the Cricut so take that into account when using this technique.
Update 8/18/09 here are some great, much simpler, tips for solid lettering with markers on the Cricut from HeatherM.