Can I do a dual install of KDE and Gnome safely?

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I have been tempted to install Ubuntu 11.10 for ages. But I dont want to, I have my current install of Kubuntu just the way I want it. Would there be a way to boot into Gnome via a terminal command without it effecting KDE?

Yes, although you don't "boot into" it in quite the way I think you mean.

Once it's installed you just get to select which GUI you want to use when the initial "welcome" GUI login screen appears. IIRC it's a small drop-down menu along the bottom of the dialog which ends up being populated with as many GUIs as you have installed.
Remember that KDE, Gnome and all the others are just window managers sitting on top of X itself and they neither interfere with each other nor X. Well, assuming you've installed them "ready rolled" via apt-get. Probably not a good idea to try and do it by hand from tarballs.

So I can just apt-get gnome and choose it at the welcome screen (I thought that is the way it goes) ?

Yep, that's about the size of it.

Just apt-get ubuntu-desktop.
Now I have booted into the GNOME interface, I have no Unity or anything. Just the desktop with some icons.
What do i do?

What are you trying to do now that you have the GNOME desktop? The menu is somewhat like KDE, except the menu on the panel should have three choices, namely, 'Applications', 'Places', and 'System'.

'Applications' is self evident,' 'Places' is your directory, and 'System' is the place you go to further tweak the desktop settings is the place you go to further tweak system settings, either by the submenus of 'Preferances' or 'Administration'.

If you want to really fine tune the desktop and metacity hit ALT+F2 and type in 'gconf-editor' in the dialog box and hit enter, which will get you to the configuration editor, which is laid out somewhat like an easier version of REGEDIT in Windows.

To be honest I just wanted to see what Gnome is like.
The reason why Is I havent used it for 4 years.

Restart in KDE?
It's probably a good thing that Unity isn't there, from what I've heard...
You should find Gnome equivalents to the system tweaking stuff available in KDE, if you want to fine-tune things for the fun of it.
Does KDE and Gnome appear Ok on the login screen? If not, now would be a good time to find out how to add KDE to that dialog!

Yeah it apeers on the KDE drop down list.
Now I have rebooted, I boot into a black screen.
Linux is punishing me for using it.
Edit: Oh dear. Sorry, mistake It was checking the hDD for erros and the screen turned off. Sorry, my head is all over the place at the moment.
By the way, Ubuntu is working fine now :/
Sheesh. Sorry about that.

I installed both without problems when I used Linux in the past.

@Madbones: Ah good - at least nothing got broken off.

You should be able to install KDE, Gnome, Unity, XFCE, LXDE, and any other desktop you want to try side-by-side without issue.

(The only exception is installing Mate and Gnome together may cause problems. They're working on that.)

Note that if you select "Gnome" from the session menu, that will start Gnome 3, not Unity.

If you want to try Unity, select "Ubuntu" from the session menu.

I put GNOME onto an install of Ubuntu which came with Unity (before switching to Debian) and it's as easy as others have said, just apt-get it and select it on login.