Pravius,
1. I used the $9 Verizon screen protector on my first Storm and it was perfect. You also get 3 of them in that pack. IMO - stay away from ZAGG invisi-shield or any type that requires you to spray an application fluid on your screen. Go to Youtube and type in "ZAGG Storm" and watch the horror stories.
My replacement Storm has no screen protector. I am just using the Storm with the factory screen protector. When its worn out Ill remove it and use a VZW sticky screen protector.
2. "Options > About" give you your current OS, which is most likely .75 if you haven't uploaded a beta OS.
3. These are a couple good sites for 3rd party apps:
BlackBerry Software Store - powered by Handango
JC Designs Blackberry Themes
CrackBerry.com – The #1 Site for BlackBerry Users & Abusers