There is an article here that may help. It seems a bit complex and I have not tried it. http://www.bongizmo.com/blog/moving-all-android-apps-to-sdcard-apps2sd-froyo/comment-page-1/ Have you tried clearing your cache, this can save a lot of space, I have an app that does it in one click.
I just installed the APP 2 SD app (PRO) and it tells me that 14 of my apps can be moved to sd card, so at about 7mb per app and double that for a media player app it will save a lot of space. It also has a 1 tap cache cleaner built in, and you can get the free version from www.1mobile.com or just about anywhere.
Thanks Dennis - that is very useful info. Have you actually moved any of the apps it identified yet? - I'd be curious to know how it handles the shortcuts etc or whether you have to create your own on the desktop etc.