OK, since this group lacks a trapspringer, I will play the part... although it's not the usual role for me. I'm getting into a LOT of games as a rogue right now, so I suppose it's cool with me though.
I'm going to make a Whisper Gnome with the Dark Template. From what I've read on this forum, I don't have to take the 1 LA for that, apparently, so I'll be making her 4th level, but I cannot seem to access the file that you posted, Sleepingferret, that details what being an advanced race means.
I will post a character sheet presently. I expect to simply take this character along the Rogue path... no prestige class.
And... posted for your approval in the Character thread.