Google docs - limitations

Google Docs users get a lot of storage space with their accounts, but it's not unlimited.

• Docs: Each doc can have a maximum size of 500K, plus up to 2MB per embedded image. You have a combined limit of 5000 documents and presentations and 5000 images.
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  Spreadsheets: Each can be up to 256 columns, 200,000 cells, or 100 sheets--whichever is reached first. There's no limit on rows. You have a limit of 1000 spreadsheets. The spreadsheets that are shared with you do not count against 1000 limit.
  

• Presentations: Files in .ppt and .pps formats can have a maximum size of 10MB or 200 slides; files uploaded from the Web can be up to 2MB; emailed files can be up to 500K.
  PDFs: You can store up to 10MB per PDF from your computer and 2MB from the Web in your Docs list, up to 100 PDFs.

How many people can edit a Google Docs file simultaneously?
Well, with documents and presentations, up to 10 people can work on the file at the same time. Up to 50 people can edit a Google Docs spreadsheet together. And Google Docs allows up to 200 simultaneous viewers of any type of Google Docs file.