MobiPerl has a
lit2mobi command, but I find that MobiPocket's tools are still the best (which may change when Calibre gets an any2mobi capability).
Explode the LIT to an OEB (HTML, images and a .opf metafile), using either Calibre's mobi2oeb or (my favourite) "ConvertLIT GUI". Then give the .opf file to mobigen.exe, or Windows MobiPocket Reader or MobiPocket Creator. If you use MobiPocket Creator, you have the option to update the metadata.