I must say I am not a fan of the Showcase task manager. It doesn't let me hit the green check mark in the top right screen witch is needed for some apps.
I did however find a solution to the HTC task manager not showing up on all the Tech1 ROMs. If you like the old style task manager just go to the link and download the WWE vs.
http://forum.xda-developers.com/showthread.php?t=388340
The drop down menu pic is a little small but works. I've tried to fix it but no luck so far. Will repost if I succeed.