http://www.einados.com/translate.cfm Above links to a l33t speak generator.
check out
http://encyclopedia.thefreedictionary.com/L33tHas some good ones like \"teh\", the (common mispeelings :p mispellings used instead of the real world).
http://www.planetquake.com/turkey/l33t.htmMentions dialects between groups and guides to read (think didn\'t read too much of any of the above)
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\"83L03 @|23 50|\\/|3 L3773|25 70 l33t\"
Below are some letters to leet.
Just remember there are meant to be different dialects to l33t speak but I doubt that matters much anymore.
A- @, 4, /-\\
B- 8, b
C- [, c
D- |>, d
E- 3, e
F- f
G- 9, g
H- |-|, h
I- 1, I, |
J- J
K- |<
L- L, [
M- |\\/|, /\\/\\
N- |\\|, n
O- 0
P- p
Q- q , kw
R- r, |2
S- z, s, 5
T- t, 7
U- OO, |_|
V- \\/, v
W- \\/\\/, w
X- x, ><
Y- j, J, \'/
Z- z
Some Common Words (see there are lots of others already said these, but what the hell

) :
teh - the
l337 ( |337, l33t), elite
ph34r, fear
pr0n, pornography
sploitz, exploits
0wned ( pwn, pwn3d, pwnz0r3d or pwnx0r3d ), completely dominated.
r00t, administrator privileges
m4d sk1llz, talent of one sort or another
n00b, newbie
ghey (gh3y, g4y ), gay ... in games used to describe a negative result
w00t or the smiley \\o/, \"woohoo!\" usually used to describe a positive result
hax0r, \"hacker\", where the symbols are used to draw rough approximations to letters ha><0|2 (x=>< and |@ = r) etc. Haxor is sometimes found as \"Haxxor\", as symbols for \"x\" are often doubled.
h4x (haxs), hacks\"
rox0rs, rocks
sux0rz, sucks
suxxor, something or more often someone undesirable
ub3r, ?ber / super
b4k4, Japanese word \"baka\", meaning idiots or stupidity
0|<, teh ph34r t@|<35 h0Ld /me |2un0rz