1. There is no "explorer". There is Finder. In Finder, keyboard (Command J) to set your view, choose apply to all. You can also change view with Command 1, Command 2, Command 3, and Command 4.
2. There is no C: in OS X. You can rename your harddrives whatever name you want. Much better than trying to remember: are my 2006 projects on drive D or E or F?
To go up a folder level, use keyboard (COMMAND uparrow), or in Finder, command click on the little folder on the top of each window to see the hiarachy.
However, in general files should be put in the proper place in your User folder, such as documents, music, etc. There is almost zero need to go to root of your startup drive.
6. VMWare is better. If you want to share screen, Macs with 10.5 can share screen extremely easily via iChat.
7. Quicktime is NOT a video format. It's a video player (You are probably thinking about .mov files). Quicktime plays many file types such as mp3, mp4, and can play avi wmf files with the proper codecs installed (take seconds to install).
8. You want a 34mm ExpressCard card SD reader
9a. The most recent MS Office is a pig. No way to avoid it but it's ok if you can get it for free. Still better than to run VMware just for office (unless there is something that won't appear correctly in Mac Office). Mac Office has no macros, so then you might need to run vmware.
9b. Launch Apps: in finder, keyboard (Command A) will take you to the apps folder, and you can type the app, for example ichat and Command O to open.
You can also use keyboard (Command space) to open spotlight, type in the app, and hit enter.
10. You can keep your file structures.
11. There is no ivideo. There is iMovie. It exports to various formats, including mp4 which is a standard. Even if you export to mov files, QUICKTIME PLAYER IS FREE.
Screen capture:
cmd+shift+3 will save your whole screen to an image file, you can keep doing it. No need to print screen, paste somewhere, save, go back, print screen, etc.
If you do cmd+shift+4, you can choose which part of screen to capture with your mouse.