Yahoo had a big day on Tuesday. Yahoo pulled the curtain back on a fresh new HTM5-optimized version of Yahoo Mail. The kicker is this newest optimization is for the iPad.

Those of you already using Yahoo Web Mail on an iPhone will feel like you’re visiting your best friend. The iPad version takes the improvements made for the iPhone, spruces them up, and optimizes them for the sexy screen on the iPad

The goodies don’t just stop at pretty layouts and HTML5 optimizations though. Through the miracles of modern caching technology, Yahoo Mail on the iPad will also cache user emails. This is great for those times when WiFi is completely unattainable.

This means that if you happen to be climbing to the top of Mount Everest and you realize you forgot if you were supposed to zig or zag at the fork in the path, you have options. You can open your Yahoo Mail on that iPad and do a quick search for what Jimmy told you to do. Thanks to that email cache, you can look at the map he scribbled on a napkin and emailed you earlier in the week.

This just shows us that more companies are willing to comply with the Apple enforced HTML5 standard than consumers give credit. Of course, the umpteen trillion iPods, iPhones, and iPads that are currently in use are probably more to blame than anything else is. It is still nice to see companies providing updates to their web services to cater to everyone. Are you reading this Google?

The new Yahoo Mail is available to anyone in the world with an iPad and access to the Internet. Just open that Safari app and point it to http://mail.yahoo.com. Yahoo will take of the rest from there. It might also help if you have a Yahoo Mail account.