Hi Alan,
I like your clean and ordered design. The only ironic feeling is that everything in your design is boxed and this does not support your tagline 'thinking outside the box'
Please find my usability remarks below:
Keep up the good work.
Cheers!
Michael

Probably because this element is not 'boxed' enough it blends with the website which gives the impression this is a part of design
I would suggest getting rid of this separate 'screaming' black bar and moving 'our work' button to the end od 1 2 3 4 5 section in the above portfolio box
this section tell nothing of real value
1 clever sentence should be enough. Something like: *Maintain and controll your own website & blog with minimum effort with our content management solutions.*
I have hard time picturing your prospect clients following you on twitter? People are usually so data overloaded anyway.
hi! concept is nice overall. Fonts are good but i wish you made gray colour a bit darker - it's hard to read, especially because of high contrast with black fonts.
As for top of the page like sth is wrong with alignment of logo and navigation bar. Try to move navigation box a bit higher or play with sizes of menu items