TABLE
From the Insert Pull Down Menu and also from the HTML Toolbar, there are selections for :
Table Tag, Table Row & Table Cell<BR> These allow you to select text & put the open and close tags for Table, Row & Cell around the Text. This allows you to manually build a Table around text you already have. Since the text remains highlighted, you should start from the top of the Table Hierarchy and go down. That is to say, highlight the text and choose 'Table Tag' first. This puts the open & close tags around your text, but leaves it highlighted. Then, choose the Table Row selection, which also leaves the text highlighted so you can then choose the Table Cell selection. When you do, you will get some of the most common Table Attributes to choose for that Cell, including, Spacing, Padding, Width, Height, Color, etc.

The Table Assistant does things a little differently. Here you can create the Table with the amount of rows and cells you want and then insert the text or image inside the cells individually. One of the great features of the ASP Express's implementation of Tables is that with 'indenting', in a hierarchical fashion, it is made much more easily readable.
The Table Row tag is indented to the first tab stop inside the margin. Then, the Table Cell tag is indented to the second tab stop inside the Table Row tags.

Also, there is a Background Color item which can be selected. This can be put within the Table Open Tag, the Table Row Open tag, or the Table Cell Open Tag. But remember there's no way to automate this one. Wherever you cursor is, that's where it will be inserted. The best choice is to put your cursor just inside the closing bracket of the tag. This way, a space is inserted just before the BGColor command is inserted and it is put in a reasonable place.

There is also a list of common Table Cell attributes that are insertable. Again, there is no really good way of automating this either except to make it necessary to put your cursor just to the right of the 'TD' inside the Table Cell open tag. If you don't, you will be prompted to do so. The cell attributes are :
Cell Alignment (vertical & horizontal)
Cell Width & Height
Cell Spacing & Padding
ColSpan & RowSpan
NoWrap

Also - from Insert/Table/Create Table from Text:
If you type in or copy in tabbed text, you can automatically create a basic table by highlighting the text and choosing this item from the pull down menu. Every tab on a line will convert to a cell and every time Enter is pressed, it will convert to a Row.
Be sure to press Enter one last time on the last row and continue the highlighting all the way down to that line and Presto! -- you have a table!

One other note - make sure you have the same number of cells in each row - you might get mixed results if not!

And, of course, the ASP.Net check box does just what you would expect here. It creates all the output in .NET format instead of pure HTML.