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
FaqMaker FAQ FaqMaker 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.