1) CHANGE ALL FONTS TO VERDANA
2) get rid of the left side bar having a gradiant which does that looks bad.
Web Design is not a competition to make really complicated sites and fill them, actually the best sites can be the simple ones. Yes there are loads of little problems that need removing BUT I would go back to the design and simplify it.
DO something original,
click here, it would look better if you made something original rather than copying streamlinenet.co.uk just not as well.
If I have been a bit critical I'm sorry I was just trying to advise you on perhaps reworking the site with your own ideas and graphics!!!
Take a look at some other sites for inspiration but don't COPY them