I have used a few adapters bought from eBay. I've also made up a few of my own since they are fun and easy to make. Here's a picture showing some of them in use:
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This shows:
PLCC84 adapter: The biggest one I've made up. You can buy these from specialist suppliers, but they are big money, so I made one with my toner transfer + FC + Dremel drill press home PCB method. I was quite pleased with this!
PLCC22 adapter: nothing to say about this really, bought from ebay. I have some '44s as well.
Power adapter board: I made this up for fun and because I got fed up with dodgy USB hacks. At some point I
will buy a bench power supply...
IDC10 adapter: Useful for AVR projects. I also made a IDC40 adapter which was used for my IDE interface prototype, and other things. Those were made with stripboard and a very fine knife cut down between the two rows of pins.
Other bodges/hacks:
A Shrink DIP64 to 0.1" pin adapter (PCB) for playing with a Yamaha V9958
Flex connector (irritating staggered 2.5mm pin spacing) to DIP adapter (PCB)
Attaching a bit of strip board to one end of a SCART cable
3.5mm sockets...
All kinds of things are possible. I love my breadboards.