Google announced the other day that site speed is a factor in the search engine ranking of sites. So all other things being equal, a faster site will rank higher than a slower one. This is important to note in terms of search engine optimisation for your site.
While we encourage creating a visually stimulating site, keep in mind when using flash and other platforms that this can slow your site down.
Also keep in mind users without broadband. I know, its hard to imagine, but there is still large sections of Ireland with ye auld dial up! 3, the company responsible for rolling out broadband to these remaining parts of the country, is only required to provide speeds at the lower level of broadband capability so, flash based-sites may be slow at these speeds also and discourage users.