How Soon Before Gmail Releases Searchable Docs?

The next thing I would like to see in Gmail is searchable documents. Attachments such as word documents, PDF, PS etc would be searchable just like the web search in Google.

A more advanced method that would really rock would work like this. You know the way Google Book Search shows pages of a book after you search for a string...Gmail should treat each document as if it was a book. This would be very easy to do since they already know exactly what text is contained within the document. When you search for something it would bring up a list of emails that contain the string. After clicking on the email instead of showing just the attachment ready to download it should show a link to the page on which this string occurs. Then you can click on the link and it would show the page in a similar format to Google Book Search with the ability to go to the next few pages.

However, with the ability to upload Warez Books to Gmail I think this would be something they would definitely not release since it would just lead to using Gmail as a store for tons of books and material that would just eat up disk space, CPU speed and bandwidth on Google's end.