OMG.........????

i have been observing for last few days, people have started using this OMG frequently.
In the forums, it is also written like this"omg" it means u r typing "oh my god" in small letter,
there are two things.
For ALLAH SUBHANAHU WA TA'ALA. this word is used with capital G...
well the most imp point is..
isnt it better to use ALLAH instead of God..
?

i would like to have suggestions here...