I gotta admit I haven't visited many RK sites, however some pages that I saw impressed me so linked to them here.  Please don't ask me to add your link, for now I'm really busy cause the university started and I don't have internet at home anymore T-Tx 

Links

Maigo-chan's RK translations - Thanks to this site I have been able to understand my RK manga.  Someday... someday... I will be able to read them by myself.  In the meantime, I love to check this site and I hope to see more translations soon.

The Kenshin Gallery- A great image gallery with lots of original pictures, it also includes a midi gallery with many RK midis encoded by the webmaster, which means you can't find them anywhere else (Omoi is my favorite ^-^x). 

T.e.a.h.o.u.s.e - A wonderful fan-fic archive with tons of cool stories based on RK, from love to comedy, here you will find what you are looking for.

Rurouni Kenshin: Unknown Side of a Battousai- This site has cool sections, and also a very nice layout, please take your time to check it out.

Kenshin Gumi- a great info site that includes a techniques page and other good sections.

Character Shrines

Miburo.com [mibu no ookami]- visit the lair of Saito Hajime, and be guided by Tokio herself.  This site have lots of info, parodies and just a beautiful layout.

Kamiya.Kaoru - beautiful and informative site honoring the one and only Kamiya Kaoru, mistress of the Kamiya Kasshin Ryuu.

The Man Behind the Mantle: Hiko Seijuro- I haven't finished checking this site but just seeing the first page made me laugh.  Let yourself be blinded by the MASTER's light of perfection.  Hiko-sama!

Kuni Tori- another villain with style, Shishio Makoto and his allies.

The Enishi Shrine- Now what can I say?  Another A+ site by Enishi no Miko.