I'm going to be trying a Linux setup soon. What I'm planning to do is install another hard drive in my computer and turn it into a dual boot system with Win 7 in my current system and Ubuntu in the new hard drive. I have read a few articles that show how it is done (looks easy based on what I have read).

I was wondering if any Linux users had any other advice with this type of setup and if they ever ran into anything odd if they tried this method. It's an I7 motherboard.

What he said. :P

This. Windows doesn't like to play nicely with any non-Microsoft operating systems that are already installed

What Distro are you planning to use?

Ubuntu, or at least that's what he said in the post you've quoted :)

Nevermind I'm blind. :P

Ya Windows is already installed so I'm just adding a new hard drive and installing Ubuntu on that.

create a liveCD or liveUSB from Ubuntu first, and try booting it.
if it doesn't, check your BIOS and try disabling SecureBoot, or switching from UEFI mode to Legacy mode.
Some fancy bios options like FastBoot/QuickBoot also occiasonally can make problems.

It usually just works these days, but it is worthwile to check beforehand imo. If you start playing with the bios options after windows is installed, there is a chance that windows might get confused.
after you have verified that ubuntu boots, install windows first, then linux, as other have said.

//edit: missed the part, that windows is already installed
well, just try and see ;)
as said, it usually just works

When you install grub, either install it to the windows hard drive (most likely /dev/sda), or install it to your linux drive (probably /dev/sdb), and make your linux drive have boot priority. The second way is slightly easier if ever you want to remove Linux (otherwise you'd have to reinstall the MBR for windows).

Nope, should work like a charm. That's pretty much how my system is configured for dual boot and I never had any issues.

As already mentioned, installing Windows first will make your life a lot easier.

This! It gets a bit more complicated if you've got an EFI based system.

you can also boot Linux with the windows boot loader if you like. you don't have to use GRUB. you can find tutorials on the web about how to access the windows boot loader to configure it, get it show it self, and set it up to give you a choice between Windows and Linux when you start the computer.