From a "what would I change" standpoint:
The logo image (http://www.mdlawnandlandscape.com/images/MD-Logo.gif
) should be resized to the final size with an image editor, never have the website "resize it". The main issue (which isn't so bad on your logo, but really seen on photos), is that the end user still has to download the full size image, when if it was saved as the correct size will easily be about 1/10th the file size.
Also, when you resize it properly in a program, you can get better results than letting the browser handling the resize, that will blend into your site better. (The first thing that made me go check the image size was that it stood out to me like crazy). Even worse was on the About Us page, because you are trying to get it to blend in with a black background.
The other thing that I would suggest is for SEO purposes.
Of first I will admit, it can be very hard to do, but you should have good specific Title and heading for the page. Repeating the company name across every page as the heading/title does not help. Search engines look for a meaningful description of the page it is looking at, and having good information will help in your search rankings. You do have specific Title's for the pages, but have no headings on page. Each page should have only ONE <h1> tag that describes what you are finding on the page..
As I mentioned, you do have different information in the titles, however try to get the wording switched around, example:
Current: MD Lawn Care & Landscaping WNY About Us
Suggestion: About Landscaping Services from MD Lawn Care & Landscaping
Again, getting the right mix of enough description, while being concise, plus balancing making it readable to humans and also to search engines, can be tricky. One suggestion, if you feel there is too much on the page to describe one main description of the information, think about breaking it out to sub pages.
The "nit pickings":
has a misspelling: fulfil
should be fulfill
Both of these pages in the Meta Description, intstallation
should be installation
(in meta description)
All three pages, Maintenace
should be Maintenance
(no, I'm not that picky, I ran a program that crawled your site ;-)
Lastly, I know you may be limited because you are using Yahoo Site Builder, but try to get the page to validate as much as possible: http://validator.w3.org/
A site that validates will last longer, display more uniformly across browsers and systems (ie. Mac vs PC) and better behaving in a mobile browser.
If you need any help on any of this, I check here when I get a break from real work, and enjoy teaching others. (Disclaimer, I am a web developer by trade, and came here after finding this section of the forum here after being on the PlowSite.com site for several years. I'm not here looking for business, just offering help in the area I have a passion about).