Here our some links to presentation and Communication skills sites we like

Business Balls has lots of useful information on all kinds of training topics from communication skills to management styles

Training Zone has many excellent training related blogs covering a vast array of topics 

Presentation Zen is run by presentation skills guru Garr Reynolds

Inc is full of useful articles on presenting, communicating and business skills of all kinds

For those interested in exploring the Alexander Technique further this is the place to visit

Entrepreneur hosts many business, branding and presentation tips 

TED is the ultimate resource for anyone studying presenting and public speaking