OK - this ain't going to make me popular, demanding this as my first post...
There are several plugins for embedding video through flash, or embedding MP3's through flash, but nothing for simply embedding an SWF file.
The HTML is fairly simple:
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=4,0,2,0" width="640" height="480">
<param name=movie value="rust.swf">
<param name=quality value=high>
<embed src="rust.swf" quality=high pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="640" height="480">
</embed>
</object>
...would embed a swf called "rust.swf", size 640x480.
It would probably worth centering the SWF as well.