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Took me quite a while to figure this one out, especially since text alignment didn't seem to work under GTK/2.
For TStringGrid one can set a default text style for a cell, like so (I do this in the Form OnCreate event);
var
gridStyle:TTextStyle;
...
begin ...
gridStyle:=StringGrid1.DefaultTextStyle;
gridStyle.Alignment:=taCenter;
StringGrid1.DefaultTextStyle := gridStyle;
This centers the text in each cell as it's default setting. Obviously you can pick other alignments as well. Just wish this was a TStringGrid property. 
