I bought Hyperballoid 2 the day it was released and was really impressed with the levels editor. I suggested over at Alawar where the game was first introduced that they should create a web site where people could post their custom made level sets.
Well I've just discovered that a site has been created (via one of Alawars admin's). It's been around since January 08. If you bought Hyperballoid 2 it will be well worth checking the site out and registering. There's only been two level sets; each comprising of several levels, posted so far; but I reckon as the site gets known, there will be many more custom made levels made available (I hope); much like there is for the Ricochet series (em>there's at least 50 000 free levels available for the last three Ricochet games, which definitely makes it worth buying at least one ricochet game (Ricochet Infinity)).
http://www.hyperballoid2.com/forum/index.php
To register you have to complete one of those verification panels where you have to type in the letters and numbers you see. I've failed to get it correct several times because it's really hard to read the letters, so you may have difficulty registering. After three attempts you have to wait for awhile before you can try again.