(1) Ask DJ_Omnimaga (the name I knew DJ_O by before he changed it) that question. Not sure if he's still around, but that's the historian you'd ask.
(2) Omnimaga meme. Live with it and eat well.
(3) Not sure, but I think it related to the drama that would happen in both the forums and the IRC channel. Sure seemed burned out, but again, that's a question you'd ask DJ_O.
(4) Cemetech has one, but it's hidden behind their SAX chat widget. I think it was Omnimaga that followed suit with OmnomIRC. But ours is more obvious because it is more awesome.

Sorry I wasn't able to help much.

Was DJ_O formerly known as xlibman?

1. It's a final fantasy related name. -aga in Final Fantasy is the strongest spell (excluding -aja). So Omnimaga is basically a strongest all-element spell (at least that's what I think DJ told me)

So a calculator forum was named after a final fantasy spell?

This forum started as a place for RPG development and discussion. Makes sense to have an RPG inspired name~

1) It came from Final Fantasy VII's Omnislash limit break and the word magic. Originally Ultimaga (Ultima+Magic) was gonna be used, but the name was already taken by my bro (see Illusiat 9). At the same time, Omni also work as some sort of prefix meaning everywhere or everything or something. Hence why the original 2001 logo has fire, ice and bolt magic pictured around it simultaneously.

And yeah almost every Omni game were RPGs until 2005 or so. There was even a site named after Omni which only had calc RPGs (some not made by Omni) in its downloads section. That was some sort of counter measure against how hard it was to find a decent RPG on Ticalc.org. Back then, on Ticalc.org, games were not sorted by genre: They were in one single category. Now, even text/menu-based RPGs are split into a separate category (almost obsoleting Omni RPG section)

2) This is an Omnimaga local meme/inside joke that got started in June 2006 by Spellshaper. Then it just spread accross the intro section (even on United-TI once). The actual peanut bag photoshop came out around Early 2007, though (In December 2006, a peanut emoticon was used too).

3) Reason 1: The drama resulting from certain people outside Omnimaga constantly finding something controversial in the way Omnimaga members or management behaves, even when it was simply a different mentality, and consequently triggering site wars between regular members. As I had more important problems to deal with in real life (which affected me even more), I simply collapsed under the pressure then handed the site to some of the current admins in July 2011.

Reason 2: After my life got better (and that I partially recovered), my physical condition, my slightly higher amount of real life activities (metal concerts FTW!) and my gradual loss of interest towards calculators and programming since Jan 2011 simply ended any hope of seeing myself ever become a regular (blue) admin again.

4) #Omnimaga is actually the third youngest calculator channel that is still active. The only younger channels are #cemetech (started shortly after ours) and #tifreakware (started in 2006). Multiple channels were used beforehand for Ticalc.org and Detachedsolutions.com from 1995 until today. MaxCoderz had one from 2002 to 2003 and from 2006 to 2008 and United-TI had one from 2004 to 2010.

Omni was also the second last TI site to get a SAX/OmnomIRC-like shoutbox that is linked to IRC. Cemetech had SAX since Early 2006, which was also used later on many affiliate sites such as Stickfire Graphic Productions, Outside the Box Programming (Calc84maniac's former site) and a few others. Omnimaga got a proprietary shoutbox system in 2010, inspired from what Cemetech had (adding more features, although SAX is much more stable).

5. Why is Netham a Lobster???

I think it was started here:
http://ourl.ca/3153

Edit: Ninja'd