I thought it was an easy one googling, but turned out more difficult than I expected.
In fact, I was unable to find a VBA ISBN based program to get book data from the web, so decided to do one.
Here is a VBA macro using the services from xisbn.worldcat.org. Examples here.. The services are free and don't need authentication.
To be able to run it you should check at Tools-> References (in the VBE window) the "Microsoft xml 6.0" library.
This macro takes the ISBN (10 digits) from the current cell and fills the following two columns with the author and title. You should be able to loop through a full column easily.
The code has been tested (well, a bit) but there is no error checking in there.
Sub xmlbook()
Dim xmlDoc As DOMDocument60
Dim xWords As IXMLDOMNode
Dim xType As IXMLDOMNode
Dim xword As IXMLDOMNodeList
Dim xWordChild As IXMLDOMNode
Dim oAttributes As IXMLDOMNamedNodeMap
Dim oTitle As IXMLDOMNode
Dim oAuthor As IXMLDOMNode
Set xmlDoc = New DOMDocument60
Set xWords = New DOMDocument60
xmlDoc.async = False
xmlDoc.validateOnParse = False
r = CStr(ActiveCell.Value)
xmlDoc.Load ("http://xisbn.worldcat.org/webservices/xid/isbn/" _
+ r + "?method=getMetadata&format=xml&fl=author,title")
Set xWords = xmlDoc
For Each xType In xWords.ChildNodes
Set xword = xType.ChildNodes
For Each xWordChild In xword
Set oAttributes = xWordChild.Attributes
On Error Resume Next
Set oTitle = oAttributes.getNamedItem("title")
Set oAuthor = oAttributes.getNamedItem("author")
On Error GoTo 0
Next xWordChild
Next xType
ActiveCell.Offset(0, 1).Value = oTitle.Text
ActiveCell.Offset(0, 2).Value = oAuthor.Text
End Sub
I did not go through Amazon because of their new "straightforward" authentication protocol ...