Looks like my response may be a bit late, but yes, you can use the HP 1018 in OS X.
If you haven't done it before for another printer, you first need to install "GPL Ghostscript" and "Foomatic-RIP". Which can be downloaded here:
http://www.linuxfoundation.org/en/OpenPrinting/MacOSX/foo2zjs
Download the first three linked items as follows. Unless you're running OS X 10.2.x, then you need the fourth item instead of the third.
foo2zjs-1.1-UB.dmg
Foomatic-RIP
gplgs-8.61-ub.dmg
After you've installed "GPL Ghostscript" and "Foomatic-RIP", you install the specific printer driver from the "foo2zjs-1.1-UB" download. None of these require a restart. Part of the driver installation launches Terminal and runs a script. You choose the printer you're using from the list and it finishes up the installation. You then have to manually close Terminal. There's a bit of a glitch in Leopard where the Terminal won't respond to the keyboard where it asks to enter your user account password, other than the Enter key. Just keep hitting Enter and it will eventually finish. Don't let it delete the installation files when it asks since that's where your startup script for the printer will be.
After loading the third package, the 1018 shows up in the Printer Setup Utility like any other printer so you can select and add it to your list of printers.
All of this only takes about 15 minutes, including downloading the files. After that, there are firmware loaders for those printers that need them (like the 1018) that you need to run each time you first turn the printer on. These are "stupid" printers that have no firmware on the printer. The Windows drivers load them in the background if the printer has just been turned on. In OS X, you need to do it manually. In this package, the loader it creates is called "load_LaserJet_firmware_v4" (the file that ends up in the installation package). Again, it launches the Terminal and loads the firmware to the printer. And again, you then need to close Terminal manually. Not a big deal of course, just hit Command+Q.
The printer will make a sound like it's about to print something, but that's just the firmware being loaded. Once done, you print to it normally. The only time you need to download the firmware to the printer again is if you've turned it off. I keep the firmware loader on my desktop. We've tried this on both a PowerPC G5 and now have the printer attached to an Intel based Core Duo 2 iMac. Works perfectly for both.