Thanks for the link Rosveen.
I'm at level 45 and have been using Sven from the beginning. Is it better to drop him and go with another? I kind of like him but he likes to rush in when I'm trying to sneak. i thought that was just the game and not just his personality. (?)
AFAIK, Beth hasn't changed the problem with followers not levelling, so it is probably better to find a replacement, or 'recycle' Sven. If you are on PC, you can use the console to do that. If you are on xbox or PS3, you will need the Wabbajack. Full details can be found here: http://www.uesp.net/wiki/Skyrim:Followers#Follower_Stats (If you have no clue about how to get the Wabbajack, I won't spoil it for you! However, details can be found here: http://www.uesp.net/wiki/Skyrim:Wabbajack)
Edit: Read further down the page about followers for a breakdown of all available followers and their particular skils and abilities.
There! Now I won't feel so guilty about hijacking your thread... umm sorry...

I'm also talking about the people whose souls he was fed. There is no telling whether his students at the college knew what he was doing. {Those at the Deep knew and they are culpable.} Azura has a habit of using a shotgun when a scalpel is all that is needed. She curses an entire race instead of just the few who were responsible. She drives Malyn insane and not only are people killed, their souls are destroyed. She could have easily taken him out. She has the power. She prefers to play games. Azura is not good. She is vindictive, vain, and cruel.
The only person at the College who was hurt was a student of his who was killed during one of his experiments on the Star. While her innocence is debateable (did she know what she was getting into? Or not?) the incident led to him being banished and going to Ilinalta’s Deep, where all of his latter victims were disciples of his.
Malen Varyn's punishment was appropriate, even if there was unfortunate collateral damage. If he had merely been 'taken out', future research on the Star (or other Daedric artifacts) might have been allowed at the CoW, but by making a horrific example of him, Azura attached an extremely negative stigma to fooling with such things. I am sure that this, in turn, made the merely curious realize the risks involved in such research, keeping all but the most selfish from attempting anything further in this area. In other words, Azura made it quite clear that Daedric artifacts were not appropriate items for experimentation, and anyone attempting to do so would meet with dire consequences. Merely killing him would not have accomplished this.