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This is a first attempt, so probably the whole implementation will change, but you can now have some control over the size of fonts. I did this for Steve who can barely read the 'posted by:' lines because they show up too small on his machine.
If you go to /system/prefs you can change the size of both the regular font and the smaller 'posted by' font. Leave the top box empty (or type default) to not alter the page font. Type in a point size followed pt to change the page font to a specified size. 12pt will get you 12 point type.
The bottom box is for the 'posted by' font size. This defaults to 'smaller' (that's how it is set now - this just makes it one step down in point size from whatever you have your browser font size set to.) You can change this to a specific point size. Probably something around 10pt or 12pt is what you want.
Feel free to experiment. Only effects what you see. Unfortunately, at this time, it won't work for pages which have their own style-sheets specified (arboretum, tommoody) and it won't work on dratfink.
Hope that helps Steve at least.