See, here is my issues with the list you presented N4H
Wentworth Miller - Prison Break
No problem here, i've seen the show, didnt think much of it, but it has given WM status now.
Jason Lee - My Name is Earl.
This guy has been around in some big movies for a while.
Now to regular folks he might not make it as a big name, but remembering the place this is, we all pretty much share a 'geekiness' and will have seen a few of his comedies. Granted this thread is about TV, but most of us knew this guy long before Earl.
Charisma Carpenter - Veronica Mars (If Doogie Howser can be up there, I guess Cordelia Chase can too.)
Again, look at the place you are posting, CC isn't simply someone we relate to another show, she was part of two of the shows that are basis for this site and they only recently came off air.
Dougie Howser...don't know who he is, and i'm pretty sure he's been of Screens as this guy for ages.
Either lead from Supernatural.
Again, Jensen Ackles is known to a fair few of us here as he was a full cast member in a pivotal plot in Smallville only last season
and Jared Padalecki had a sizable role in Gilmore Girls if i'm not mistaken, which again was watched by a fair few people here
Jennifer Love Hewitt - Ghost Whisperer. (Actually, kind of a re-breakout, back from obscurity. Does that count? Again Doogie.)
Hmmm, see what you call back from obscurity, i call the year after a Launch on the Pop charts, a year after a big movie while waiting to do the sequel.
I mean this one has been on the Silver Screen a few times over the last few years, so not really back from obscurity, as at least two of them movies have been pretty successful(God only knows why mind - Garfield SUCKED)
David Tennant or Christopher Eccleston and Billie Piper (depending on where your marking your year)- Dr. Who
See Issue here is more on location.
For a start, Eccleston is well known in the UK(before Dr Who) as well as him and Piper are part of last years TV schedule.
Tennants UK TV break out is actually a show called Casanova, based on the Man, Casanova(how weird i know)
For me though, a few 'break-out performances this year have been
Adewale Akinnuoye-Agbaje - Lost
Ever Carradine - Commander in Chief
Emily Deschanel - Bones
Michaela Conlin - Bones
Eric Millegan - Bones
T.J. Thyne - Bones
See, i gotta say i wasn't too impressed with Bones in the beginning but it is now a fave of mine, and all 4 of the actors i have mentioned i may have seen occasionally in other shows, but i had no idea who they were, but in each case(and the other None Bones) i know who they are, find their performances great and look forward to their time on screen.
Ohh i also forgot most of the Invasion Cast, all doing a good job in a mediocre show(in my opinion)