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OK, here are three types that I made up with their corresponding type relations. Bear in mind that I didn't intend them for actual addition (except for Virtual, but that was a long time ago and I've changed it), so these are not trying to be balanced or anything.

Wood-type

Offensive relations:
Effective against:
- Ground, because according to Chinese tradition Wood beats Earth
- Flying, because birds and flying insects find refuge on wood and thus, they are vulnerable without it
Ineffective against:
- Rock, because it's harder
- Steel, because it's much harder
- Fire, because it burns it
Completely ineffective against: none

Defensive relations:
Resistant to:
- Normal, because of its hardness
- Water, because it feeds on it and transports it
- Ground, because it's rooted on it and absorbs its nutrients
- Rock, because of its relation with Ground and because some trees can grow on them
Weak to:
- Steel, because it chops wood
- Fire, because it burns it
- Fighting, because some fighters can shatter wood with their hands
- Electric, because thunders can burn trees down
Immune to: none

Undead-type
This is an offshoot of the Ghost-type, to cover undead creatures that aren't intangible. Think vampires, zombies and so on.

Offensive relations:
Effective against:
- Normal, because the undead feed off the living.
- Psychic, inherited from the Ghost-type
Ineffective against:
- Magic, because magicians can control the undead to do their bidding
- Steel, because metals have evil cleansing properties in popular culture
- Wood, same reason as above
- Light, the dead aren't strong in daylight
- Undead, they usually don't fight each other
Completely ineffective against: Ghost, because ghosts are completely dead

Defensive relations:
Resistant to:
- Dark, because the undead themselves are animated by dark forces
- Psychic, because many undead are actually brainless
- Ghost, they're dead as well and usually don't feel fear
- Undead
Weak to:
- Magic, same reason as before
- Steel (think of silver bullets, chainsaws in zombie films, etc.)
- Wood (wooden stakes)
- Light, because the undead thrive in darkness
- Fighting, because dead bodies are fragile
- Fire, same reason as Fighting
- Bug, because some larvae feed on rotten flesh
Immune to: Poison, because the undead don't have body functions anyway

Virtual-type
Pokémon which are not corporeal, existing solely in cyberspace, and that are brought to the real world by special pokéballs that stay in the field projecting a sort of holographic image. That's at least how I imagined them from the beginning. You could also call it Machine-type, though that would require some changes.

Offensive relations:
Effective against:
- Virtual, because they can spread virus, trojans, spam and so on
Ineffective against:
- Psychic, because technology is nearly useless against their mystical properties
- Ghost, Magic and Dragon, same reason as above
- Steel
Completely ineffective against:
- Normal, balances its Normal immunity (see below)

Defensive relations:
Resistant to:
- Psychic, because they have no actual minds to control
- Ghost, because being machines they cannot fall easily for their tricks
Weak to:
- Virtual, because computer programs can be erased or corrupted by certain others
- Electric, because it can fry circuits and cause shortcuts
- Water, because it also damages circuits (specially if it's used for coffee)
- Ground, dirt and dust can damage them too
- Fire, yet another cause of damage
- Bug, because of computer 'bugs' (suggested by ShinE and I liked it, even if it's just idiomatic)
Immune to:
- Poison, because they're inorganic
- Normal, because they have no physical presence
- Fighting, same as above