I laugh whenever I see someone say that, they are either misinformed, or couldn’t get their site listed, so they figure its rocket science 
Rule #1 about search engines, search engines ALWAYS looks for keywords, so… so use that to your advantage, as long as you have a lot of keywords in your html for your flash movie (in the head or body tags), 9 times out of 10 it will get logged on a search engine, down below, prime example of flash being indexed lol, it is NOT rocket science, if you think its hell, it really isn’t if you know how search engines work. Its all about keywords, as you can see down below, i just typed in my design firms name into google.ca “cgnemedia” you’ll see right away google even shows my site description aswell as it being flash. Anyhow, search engine submissions is a sinch for me, all u need is, a good domain name, keywords in your html, and submit your site to search engines, and you are set, plus I get payed to do this for clients as a living, so this is fairly simple to me
Take a look at this: cgnemedia - Google Search
View the source code of my splash pages, and you’ll see that some keywords can go a long way in getting your site logged and ip spider checked.
