I recently sold my Delta Unisaw to make room for a CNC milling machine. Something had to go and that was the obvious option. Since then I've been thinking about a replacement for the tablesaw functionality (mainly ripping) that might occupy less space. Router guide tracks are one possible solution.
If it's only once in a while there is a trick you can use with a circular saw (a retired fireman from Texas taught this, found him on some usenet group decades ago).
Summary: make a guide, clamp the guide to the work, rip with a circular saw.
Buy a 4x8 sheet of masonite and a decent circular saw if you don't have one (note that even if you like a a worm drive like the Skillsaw SPT77WML, the traditional circular saw with the blade on the right side works better, more of the base will be on the guide).
Measure the distance from the blade to the saw blade (and standardize on a particular width of blade, a thicker blade will mess this up). It's typically about 5 inches, give or take.
Chalk line an 8 foot by 10 inch chunk, cut that. Go to the opposite side of the sheet and chalk line an 8 foot by 4.5 inch chunk (if your saw has a different distance to the blade adjust accordingly).
Take the smaller chunk and glue it to the bigger chunk, lining up the two edges you just cut. Make sure that the bigger board sticks out more than the distance between your blade and the edge of your base (in our example that's 5 inches, we are putting 4.5 inches on 10 inches, leaving a 5.5 inch base).
This leaves the factory cut edge of the smaller chunk as the guide. Clamp that contraption someplace where the edge overhangs by an inch or so and put your saw on it, push up against the lip made by the smaller chunk, and cut off the extra 1/2 inch.
Presto, you now have a guide. Want to rip a sheet of plywood? Measure, clamp the guide to the marks, run your saw along the guide, away you go. Clamp the guide over the chunk you want and you don't have to worry about saw kerf, it's coming out of the waste.
Once you have one of these you'll make another one only about 5 feet long so you can do cross cuts.
If this isn't clear, email me and I'll try and draw a picture. It's really a lot more simple than I've made it appear, the details are there because it's easy to not think of one of them (like changing saw blades). For that reason, and others, I have a dewalt saw that I use only for these guides. Circular saws are cheap enough that I have several, the guided one, one with a diamond blade for cutting up my driveway, a worm drive for framing, a battery one for when I have no power, etc.
Any suggestions?