G4 is a rough equivalent to a Pentium 4 (though slower)
G5 is a rough equivalent to a Pentium 4 Xeon (though faster according to Apple)
Mac OSX is the newest operating system for the Macs as Windows XP is the latest version for PCs (IMHO, OSX is far superior to XP functionally, not even counting that XP is seriously ugly - again, just my opinion)
Jaguar is the codename/nickname for OSX version 10.2 and Panther is the name for 10.3. Similarly Longhorn is the codename for the next version of Windows (due to be released in 2005?).
Safari is a web browser created by Apple which is free to Mac users (well free to anyone I guess but it only runs on Macs.)
Windows 95 and 98 are another matter. IMHO they have no place in professional practice (Windows NT, 2000, and XP are the only versions I have ever recommended), and Windows ME is a horrorshow. Thankfully this troubled line of DOS progeny has come to an end giving the long suffering users of those older machines the opportunity to switch machines that not only work, but are works of art. (Seriously, most museum design collections include at least one Mac. I would be very surprised to ever see a Dell in an art museum - except maybe in Austin
Maybe some IBM harware by Richard Sapper could make the cut.)
PS:
I hope everyone will excuse my sliding into a bit of a Mac/PC diatribe, but I just went through a very frustrating experience last night helping a friend set up a wireless network with some old (and not so old) PC laptops. After five hours of screwing around with different attempts to install the drivers we managed to get the one newest one working and figured out what we would need to finish the job on the others (additional discs and hardware we didn't feel like searching for at midnight). These were not wierd no-name machines either: a Dell Inspiron & Latitude and a Sony Vaio.
I was surprised by the Vaio. I have always liked their looks and have always held Sony in fairly high regard, but it felt kind of cheesy to me. The build quality definitely did not seem up to what I am used to from IBM and Apple.
She also has an old IBM 486 ThinkPad which I didn't try to setup for wireless (I doubt that it is possible and haven't the time to find out) but it is, curiously, the nicest machine of the bunch. The screen is still perfect and it starts up and runs nicely with Windows 95. It is the "butterfly" keyboard model which is surprisingly sturdy. (I am already a fan of the ThinkPads, this just reinforces my bias.)
By contrast my PowerBook was instantly connected from the moment I arrived (seriously, I opened it, turned it on, and had immediate access - it even told me the names of the other access points in the building). I have also set up a 1998 vintage PowerBook for wireless in OS9 easily & OSX with just a little trouble to find an open source driver on the web. All of the PCs are newer than my old G3.
This experience is not because I am more familiar with Macintosh. While I have spent more time working WITH my Macs, I have spent (much) more time working ON my PCs. This is despite the fact that I use ThinkPads which I find much easier to maintain than other PCs.
Anyway, enough ranting. I feel better now, thanks.