In order to create formatted text in Google Mail - especially tables, first create the table in Excel then copy from Excel and paste it into mail you are composing GMail. Note that this will only work if you are using FireFox or Internet Explorer. It does not work with Chrome.
If you are using FireFox, you have an additional ability to delete content from the table by column or row.
One problem I have is when it is forwarded to Lotus NOTES, the fonts appear to run so some of the rows may contain strange highlights or fonts.