My preference would be "online". At Dictionary.com "on line" gives you a suggested result of "on-line" and "on-line" give you "online".
Google tell us:
online: 14,300,000 results
on line: 6,730,000 results
on-line: 6,730,000 results
It for "on line" and "on-line" it asks do you mean "online".
So..... "online" it is! :)
Dino_M
1:55 pm on Nov 19, 2002 (gmt 0)
unless your in a really competitive area and then you might consider targetting one of the others, but for pure numbers of potential users online wins hands down.
fashezee
2:00 pm on Nov 19, 2002 (gmt 0)
thanks ....
korkus2000
2:29 pm on Nov 19, 2002 (gmt 0)
Remember that AOL is America Online. That maybe effecting the google counts. I believe that online is the correct american version.
BlobFisk
2:55 pm on Nov 19, 2002 (gmt 0)
Good point about AOL - never even thought of that.
For International and UK English, "online" is the acceptable norm.