Golly macrocell files as well as .zip archives are now supported for pattern files on LifeWiki. Example pages where they are in use:
http://www.conwaylife.com/wiki/Parallel_HBK
http://www.conwaylife.com/wiki/Caterpillar
Their usage on the wiki is very similar to RLE pattern files and the other file types: add "|mc=true" or "|zip=true" to the pattern template box at the top of a pattern's page, just like you would add "|rle=true" to add a link to the RLE file for the pattern.
As always, to actually upload a pattern file to LifeWiki, e-mail me the file. Especially now: if you notice any large patterns on LifeWiki that don't currently have a pattern file, please e-mail me such a file in either Macrocell (.mc) format or as a zipped pattern file (the format within the .zip isn't so important: RLE or macrocell) so that I can add it to LifeWiki.