No. The current version of PI WebParts requires Adobe SVG Viewer.
As a side note, version 4 of PI WebParts will be using Microsoft Silverlight as the rendering technology - according to our Engineering Plan, this is currently targeted for somewhere in the second half of 2010.
If you are up to some coding you could create your own webparts using simple images of charts/gauges or use (existing) charts for ASP.NET.
Some of them are free to use/open source. There are some really cool ASP.NET controls floating around the web that might be of interest to you.
You will not have the same speed and flexibility as with the PI WebParts though, but maybe it could be an option.
@Steve: Looking forward to the Pi WebParts 4 version! But if he cannot install the SVG viewer, chances maybe slim that he can install the Silverlight runtime, am I right?
Michael @ Atos Origin
If you are up to some coding you could create your own webparts
Coding your custom web parts is definitely an option... however I doubt an organization that does not allow Adobe SVG Viewer to be installed, will be keen on deploying, managing and maintaining custom bits of code.
Michael @ Atos Origin
But if he cannot install the SVG viewer, chances maybe slim that he can install the Silverlight runtime
Yes and no... technically, I agree that's pretty much the same.
However, conceptually, a number of organizations will want to allow Microsoft products whereas other products (such as Adobe's) hit the "no custom stuff" mental boundary
Just my 2 (canadian) cents...
BTW, I'll move this discussion thread back to the "SharePoint Development and Integration" forum, as it doesn't really pertain to web services and our PI Web Services product.
Michael - Your 2 Canadaian cents are valuable. Please keep posting them!
Actually, Michael's would be Euro cents...
Mine are Canadian
In most cases, not being able to install SVG viewer on users PCs is not related to who made the software (Adobe instead of Microsoft).  At many locations, users do not have admin rights to their desktops and cannot install any new programs. Also,  by default, when a user's browser detects that the SVG Viewer is missing, it tries to download it from Adobe's site. This fails at many sites, as users do not have Internet access on their desktops (an admin has to come and install it from a known location).
One (expected) good thing about Silverlight is that it is available through Windows Update. Therefore it has more chances of being on the users' PC. Things would be nicer if it were installed automatically with Windows 7 (not the case).