As of now, the mazagines from January 2001 (less the last few issues) are all online HERE.

The remainder of the print run of This Rock, going all the way back to the first issue in January 1990, are expected to be online in two months.

After that, we'll continue to post new issues of the magazine, but lagged by about three months (unless you're a subscriber, in which case the plan is that you'll be able to log in and read the new issues immediately).