If you're seeing each more than twice a day on your clock, it means your clock is broken. :)

That happens to me almost every single day. I always look at the clock and it will be exactly 11:11. Other times I'll see 9:11, 3:11, 3:33 (usually a.m.) or 4:11.. It almost becomes annoying sometimes as I think what is the significance of it. Here's something I found on numerology about the number 11:
"Eleven is a higher octave of the number two and is considered to be a master number (the second master number being 22). 11 is considered the path of spiritual awareness and knowledge beyond the grasp of others. It carries psychic vibrations and has an equal balance of masculine and feminine properties. It is also related to open-mindedness, intuition, idealism, and visions. Because eleven contains many gifts such as psychic awareness and a keen sense of sensitivity, it also has negative effects such as treachery and betrayal from secret enemies."

and heres the description for 22 since if you add the two 11s its 22 (god I feel like such a schizo right now.. lol)

Twenty-two
Twenty-two is a higher octave of the number four and is considered to be a master number. It contains the secrets to many esoteric questions, as evidenced by the fact that there are twenty two letters in the Hebrew alphabet, twenty two pathways in many versions of the Kaballah, and twenty two cards in the Major Arcana. Twenty two carries with it psychic gifts such as heightened sensitivity, intuition and psychic awareness, but is also predisposed to pitfalls such as treachery from hidden enemies and over sensitivity. It is also an approximation of pi times 7, and also the number of pounds in 10 kilograms.

This is a very popular theme. Here's the meaning:

www.drboylan.com/11.11laws.html

Triple numbers of any kind involve helpers