When I first viewed your site it looked like it was stuck in maintenance mode, hence the link I provided.
Now your server is down again, which makes it tough to figure out anything.
Have you created the pages you reported with the bad links?
Can you get in to Dashboard?
Go to Dashboard > Manage > Pages, click on one of the page titles, look under the TITLE box for something like this
Permalink: http://cbooksynd.x10hosting.com/about/ Edit
Does the above path match the page you are trying to get to?
Or does it look like this
Permalink: http://cbooksynd.x10hosting.com/index.html/ Edit
It should be the same path as the page you are editing. If it's wrong click Edit and change it to the correct path.
Tough to give you feedback with your server down, so I hope this helps.