Lots of good teaching / training video / written content available online now. Just one word of caution, there are many teaching methods (many paths to the top of the mountain), they may be different to what / how you're being taught in the dojo but you should always follow what your dojo leader / coaches are telling you.
Kendo - the perfect ippon. A longish video, from Japan, explaining what Kendo is all about. We don't do tachikiri-jiai (the endurance training)!!
Beginners Course Syllabus The start point for all newcomers.
Beginners Quick Guide A quick overview of what to expect in the dojo.
How to sit in seiza (video from Alex Bennett Sensei)
Bokuto Ni Yoru Kendo Kihon Keiko Ho 1-9, demonstrated by Sumi Sensei
Kendo Basics, okuri ashi practice (footwork) from the Kendo Guide YouTube channel.
All Japan Women's Kendo 7th Dan Tournament Nippon Kendo Kata-Enbu (demonstration)
Seme, the lifeblood of Kendo by Gary O'Donnell Sensei, Nanadan
Andy Fisher Sensei has an excellent set of videos, full of tips and instruction on The Kendo Show "Zero to Shodan" is well worth a watch here.
Masahiro Imafuji (Hiro) also has an excellent website, The Kendo Guide Again, lots of useful tips and instruction. Imafuji sensei regularly comes to the UK at the Kodokan Seminar.
The Kendo Guide is also on YouTube, great selection of teaching video. And all in English, bonus.
Sadly no longer with us, Geoff Salmon Sensei's family agreed to leave Sensei's blog online. A mine of knowledge left for us, you can find it here
Shin Ki Ryoku, the heart of refined Kendo by Gary O'Donnell, Sensei, Nanadan
AJKF Kendo Kata
In depth Kata teaching by Masayoshi Miyazaki sensei and Hiro Imafuj sensei (2015)