Yep - there is an active post about it. How many slides will your adaptor hold? Mine does 4 at a time, but I see a HP one that will do 16. I would load my 4 slides -hit the scan button and come back after a few minutes and load 4 more. It took a while, but I managed to get quite a few scanned. The higher the dpi - the longer the scan time, but it is a higher quality file. I did mine at 600 dpi and was more than satisfied. I put a little dot on the ones that I had scanned - so I wouldn't do them twice. Here is a link that might be useful: Scanner Thread.

I would have a hard time tossing the scanned slides also - but understand your space limitations. I have an Epson flatbed V200 scanner that I scan slides with. LOVE IT! Love it even more with my new computer that runs so much faster (didn't have any trouble with it working on the new Windows 7 OS either) My Epson is no longer available, but the V500 is pretty much the same unit. I looked up both the Epson and the Cano Scan on Amazon. Looks like both will scan 4 slides at once. I have done large batches (hundreds - not thousands though). It take a while, but if you leave a stack, and just swap them out while you are on the computer, you can get a lot done! I like reading the reviews on Amazon - gives great reviews from people that have actually used the unit. Both the Epson and the Canon have lots of reviews. Price is very similar. I like the Epson flat bed personally. You can scan documents or photos. I find it super handy just to copy a paper when needed. It is NOT an all in one. Just a flat bed scanner. But if I need a copy of a paper, I can just hit "copy" and it will scan and send it to my printer. I scan at 600dpi - which is plenty. Unless you are going to print somthing wall size, you don't need to use the super high settings. It will just make a huge file and take a long time to scan. Make sure you have a couple back up sources for you scans if you are going to dispose of the slides. DVD's can go bad - hard drive fail... I would use at least 2 different backup methods. Here is a scan from a slide from the late 40's or early '50's. Slide had dust and a few scratches.....

If you buy something, get a photo scanner, not a "flat bed" scanner with some after-market backlight arrangement. Most, many(?) scanners, especially the ones that come on the "all in one" multipurpose machines have only 300 dpi resolution, way to low to get anything like 35mm film quality/resolution. I have a low cost Epson Perfection V100, it has hight resolution. I think I got it on a rebate offer about a year ago for about $60.

I use PSP7 to fix issues with photos.