|I realize now that I was asking four questions:|
1. Where are the TIFs (temporary internet files) in Windows 7 with IE8?
ANSWER: Do IE - Tools - Internet Options - General tab and look under Browsing History - Settings for the path to the TIFs.
2. How can I explore and copy files from that stuff?
ANSWER: Change the settings of Windows Explorer (Organize - Folder & Search Options - View), turning on "Show hidden files, folders and drives", and turning off "Hide extensions for known file types" and "Hide protected operating system files". Then use Windows Explorer to look at these locations: C:\Users\<username>\AppData\Local\Microsoft\Windows\Temporary Internet Files\ and C:\Users\<username>\AppData\Local\Microsoft\Windows\Temporary Internet Files\Low\ . Typically the TIFs of various types will be "below" these folders in the Content.IE5 folder.
3. Will I see recently viewed YouTube videos among the TIFs, like with Windows XP?
ANSWER: No, I didn't see any vids or vids data files, just icon files and such. Microsoft has gone to extra lengths to hide from us certain things that flow to our PCs through IE.
4. Aside from using an FLV downloader, how can I download from You Tube and other FLV-streaming sites?
ANSWER: KeepVid will find a video on YouTube's server and queue it up for a file transfer to you.