This might be a little late with the Diablo 3 beta starting soon, but I thought it was worth mentioning.

If you're not a Blizzard Employee, a Friend & Family member, or have any inside connections, but you desperately want to increase your chances of winning a Diablo 3 Beta invite, I have couple suggestions.

Most of the guides out there suggest that you join a top end guild, have a high end gaming PC, or get in good with a Blizzard employee. If you're a past beta tester, chances are also higher for you to be invited back too.

Now, in order to opt-in to the Beta Invite, you need an active Battle.net account with any Blizzard game title attached to it. Then, "Beta testers are chosen according to their system specifications and other factors, including an element of luck."

You can't just create hundreds of B.Net accounts and create Free Starter packs to opt-in, unfortunately, it has to be a full version game attached.

Here are my suggestions;

* Use your classic games. If you're lucky and still have Diablo 2, WC3, or Starcraft CD keys (or any expansion packs) lying around that haven't been registered to your main B.Net account, simply create new B.Net account names (register them to your family members if you want) and use each of those CD-Keys individually for each B.Net account. If you have WoW, D2, D2:LOD, WC3, SC, and SC:BW you can have 6 Active B.Net accounts that are all eligible for the beta.

* If you're more desperate, and have the cash, all of the classic games can be obtained from pawnshops, EBay, Amazon, etc. for $3-10 per game.

* Check with friends or family members with old CD-Keys that they don't use anymore. All you need is the CD-Key to register it to your B.Net account. You never know who out there hasn't played the game for years, but still have the CD case or box lying around.

* Even if you only have 3 CD-Keys.. at least you're 3 times closer to win than before. :)

* Blizzard can replace a lost CD-Key, if you turn in your CD case or manual as a replacement. However, there's a fee of $10 which is typically more expensive than what you can buy it for elsewhere.

* If you don't have the money, but have the time, you could attempt random CD-Key generators. This is rather insidious, but it is possible to generate random CD-Keys that can be authenticated on B.Net. They're extremely rare and will take a lot of time, but if you don't mind the risk, it's a viable option. This link, for example, generates Starcraft CD-Keys which are the most simple to create and authenticate. I'm not sure if it's randomly generated on the backend though, or displayed from a pre-made list. I tried a couple dozen, and ended up with 3 that were legit however they were claimed and in use by other users. Diablo 2 CD-Key generators also work, but are more difficult to get a real B.Net key. Just make sure you create a new B.Net account, a new email address, and do this through an anonymous VPN service.

* You don't want a high end gaming PC, if anything, submit system specifications for an average gaming PC. Blizzard wants to reach the widest audience possible, and the most invitations will be sent for average PC builds.

* Network and make friends with players with B.Net accounts (e.g. your guild mates). Convince them to opt-in. Many beta winners won't have time to play (too busy with school) and will offer the beta key (no "keys" for D3 Beta AFAIK, instead the account is flagged) or share their B.Net account.

It's called a beta, but it isn't so much a beta as it is a demo. There will be very little change between the D3 "beta" and the retail release. Just like WOTLK and Cataclysm. It's more of a stress test on their new servers and authentication systems. The D3 beta is supposed to be much shorter than previous Blizzard betas as well.. so, just hang on there and I hope this information helps out some of you that forget about your classic games and unregistered expansion packs. :)