Acer's Upgrade Assistant tool can be used to see if your computer is a compatible model.
Another helpful resource on Acer's site is their Affected Model List, which categorizes their Windows 8 compatible PCs by any issues you might encounter when installing Windows 8.
If your computer isn't listed, it doesn't mean that Windows 8 won't work with Microsoft's included drivers, it just means that Dell does not recommend installing it and will not provide Windows 8 drivers and support.
Dell also keeps a list of their computer systems that they have tested with Windows 8: Dell Computer Support for Windows 8 Upgrade.
Note: Creative also lists Windows 8 drivers on their availability chart for other devices from Creative including MP3 players, webcams, speakers, headsets, and more.
More » Windows 8 drivers for Dell computers can be downloaded via Dell's standard support site, linked below.
Below is a three-page list of information on Windows 8 drivers and general Windows 8 compatibility information for major hardware and computer system makers, including Acer, Dell, Sony, NVIDIA, AMD, and much more.
Please let me know if you've noticed more recent Windows 8 driver information from a particular manufacturer but I haven't yet updated this page.