DreamHost will normally only fully support the unix admin and the Apache server itself, but will debug pre-installed PHP libraries and such. In addition, they provide limited support for some web applications in the form of One-Click installations. This only means that these apps in their vanilla form are sort-of guaranteed to work (this eliminates some amount of debugging on your part, I suppose).
You will often get a lot of community support here on the forums, though. What kind of site do you have? Is it based on a popular web application like WordPress or Joomla! What's broken on your site? And finally and most importantly, who created your site in the first place? It doesn't sound like you're the original developer.
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