The following is the comparison of the used space difference between before and after:
|Command: df -lak||Used(Kilobytes in 1024-blocks)|
After my updates, I watched a nice podcast: 309 - Lion - Finder & Safari [Free Sampler Show], by ScreenCastOnLine. It shows so much and nice features of Lion. I love those features.
By the way, one thing I notice is that there is no more podcast URL links. The URL copy is for podcast only, not for an item. I remember the previous iTunes (may be fore Lion) has Copy URL for a podcast item, which is a long name of URL for iTunes only.