Jyan,
No, Attachment data type fields are not really for images, in the sense you are asking. They are for storing attached files (of any type), but this won't work well for the display of images. I recommend that you continue with the practice of using a text field to hold the path/file name of the image. The cool thing with Access 2007 and Access 2010, though, is that the Image control for your forms and reports now has a Control Source property, which you can set directly to the name of this field with the image's path/name, so that makes it a lot easier to manage images compared with the old versions.