Ok if you like stealth here are some further tips.
Spoilers on how to get high chameleon gear below:
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One of the Daedric shrine quests (Meridia) gives you a ring with 35% chameleon. Sigil stones come with 30% chameleon. If you use that ring together with 2 items enchanted with these sigil stones, you'll get 95% chameleon. This is enough to sneak past (and remember to sneak) any enemies, while still doing things like casting spells and open chests etc. So 3 enchanted items is enough, compared to making 5 items out of grand soul gems each with a chameleon effect of 20% to accomplish the same (well, 100%).
I like this 95% scale as you'll sometimes get detected if you cast spells directly at enemies (but you can still summon) and if you stand up in front of them, thus not making you completely invincible/invisible.
To get the sigil stones with chameleon is a bit cheaty though (unless you're very lucky). Just quicksave just before you take the stone and check the effect when you get it. It's random every time. Keep quickloading and grabbing it until you got it.
Sidetip: Other very handy sigil stones for mages is fortify magicka 50%. I'm wearing 3 armor items with these, and have a total of 524 magicka (I'm an Altmer (+150 magicka) mage (+50) with 100% intelligence). I've almost stopped using ordinary weapons, as all my magicka enables me to create any location into a living hell for any enemies, while I myself are mostly hiding cowardly in the corner watching the fun...

Btw I think this belongs in the cheats and hints forum.
This post has been edited by Olav: May 19 2006, 01:44 PM