Hello,
I work for a medium-sized web company, and we do a lot of DotNetNuke work - one of the things that we have noticed is that the module print buttons, under IE7, break the CSS for the portal. This is because Response.Write() was used in ActionBase.vb to output the <script> tag needed for the window opening code - I have managed to find a better way. Unfortunately, the bug tracker at support.dotnetnuke.com is broken, and won't seem to let me find the original bug report and submit my fix - so I am submitting it here.
For those who are interested in modifying the source themselves, you need to modify line 159 of Library\Components\Skins\ActionBase.vb, so that it says this:
Page.ClientScript.RegisterStartupScript(Me.GetType(), "DotNetNuke.NewWindow", String.format(" ", Command.Url))
If you don't want to do the work yourself, I have built a version of the Library from 4.8.4 into a DLL, which can be downloaded at http://girasquid.com/downloads/DotNetNuke.dll - simply download it and replace the version inside your portal's bin directory.
Cheers,
Luke