What' the easiest way to add talking bubbles to HDV footage shot on HV20 & XH A1?

"talking bubble" as in the one they use in comic books.... :)

The software that I currently use to do HDV editing doesn't do this.
My old DV camcorder's included software did this little trick, but it
is not capable of handing HDV video.(and I don't want to down-convert
HDV to DV for this purpose)

Looked at some other software, but haven't found one that does it...
I don't need anything fancy... it can even be in just black and white...

any advice appreciated!

Why not just use a combination of Premiere and After Effects? I actually finished up a video with something very similar to what you mentioned and it was done with those two programs (and Photoshop for some image handling).