Before you contact you may try doing a search (using the search field in the left hand toolbar). You may also want to look at the FAQ's for each plugin and read the change logs to verify that you have the newest versions

RapidBlog FAQ		RapidBlog Changelog
Sitemap FAQ		Sitemap Changelog
Lockdown FAQ		Lockdown Changelog
Rapidflickr FAQ		Rapidflickr Changelog
Pluskit FAQ		Pluskit Changelog

If you still have questions that a search or the FAQ's/Changelogs don't cover send email to If you don't hear back within 24 hours please check your spam folder and/or re-send your request.