Cool, I vote for preloading all at the start as well. I have an XML document like this:
code:

<transitions size="800x600" bg="0xFFFFFF" framerate="30">
<trans file="transitions_v1.swf" bg="0x000000" author="flashl!ght" pause="500"/>
<trans file="transitions_v2_admedia.swf" bg="0x583A70" author="admedia" pause="250"/>
<trans file="transitions_v3_dricciotti.swf" bg="0xA20909" author="Dricciotti" pause="250"/>
<trans file="transitions_v4_jaquan.swf" bg="0x0000A1" author="jAQUAN" pause="250"/>
<trans file="transitions_v5.swf" bg="0xFF6600" author="flashl!ght" pause="0"/>
<trans file="transitions_v6_admedia.swf" bg="0x80543A" author="admedia" pause="0"/>
</transitions>