Use Microsoft Publisher, its the dogs nuts for doing flyers. And best of all you can save them as 300dpi pdf files (which printers need). As default it is 150dpi but its easy to change this setting so that all future files are kept at 300dpi.
We use it for flyers and for directories i.e. Thomson/YP. You can even save your project as an image (JPEG) if needs must! You really cant beat it.
Hope it helps
Kev