I bought a Dell tablet and I really liked it except for when I really needed to get some work done which is when I started hunting for a bluetooth keyboard.  Since I'd already purchased the nifty aluminum keyboard from Apple for my iPad, I connected it to my tablet.  All was well in the world until I started looking for my favorite Windows keys.  Stumbling upon this site, I found that 'some' of the combos work, others not so much but I still think it's helpful nonetheless. 

http://support.apple.com/kb/HT5636

The one that really drove me nuts was the Windows delete key which can be had by simultaneously holding the CTRL and D key.

You go to a web site, you want to download something and you're required to give an email address, possibly to confirm you're a real person.  In most cases, I create an alternate SMTP address on my mailbox, acknowledge their message and then delete the address from my mailbox.  As an alternative, this site enables you to create any email address and receive messages which can be viewed through their site.  Be warned, EVERYONE can access this email so I would only use it in cases when the received mail is meaningless.

http://www.mailinator.com/index.jsp

If you work in the IT industry, you know regardless of whether or not the issue is on your end, you need to determine the location of the problem in order to prove your innocence.  ;)

When mail issues arise, we use:

http://mxtoolbox.com/SuperTool.aspx

There are quite a few options on their site but at the very least, you can see if a mail server is blacklisted.