It might be fun also to cover octal - it's still useful you know! Possibly extend this tutorial to cover the representation of different types of data, like floating point (mantissa and exponent) notation for numeric quantities with a fractional part, two's complement for negative numbers, etc. Also, discussion of storage of textual data (ASCII and EBCDIC) and possibly some kind of description of BCD, could be useful to newbies.

Just a thought,

- Freon