I've just uploaded a new version of my item editor, it works with the new 0.3.4 data format.
http://www.geocities.com/kaiyodouk
DISCLAIMER: I've not been able to test any of the items on the Emu as I'm having 'Incorrect version' problems at the moment. I'm pretty sure they should work, please tell me if they don't

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Edit: I have checked them now, they work)
For this release I've actually used the Hackersquest item structure as I moved my editor over to 0.3.4 before the EQEmu source was released. You might find some of the names of the fields have changed, and there are a few more things you can modify now, like faction adjustments and GM flags (Amulet of the Haven wil show you how to make faction mods).
Note that AC, Mana and HP can now be in the range -32768/+32767 rather than -128/+127 as in previous versions.
The editor can also perform a little conversion, it's only useful if you want to save a few items as you have to do it manually for each one. To convert an item you need to have saved it out as a binary file from a previous version of the editor as a .item file. You can import these into the new editor and they will be converted to the new format. They will unfortunately lose any skill mods and bane / elemental damage modifiers as these didn't quite work properly when I tried converting them.
A little warning, trying to connect to a pre-0.3.4 database will cause all of the items to be converted internally in the editor (it won't touch your database). If, however, you click 'Send to database' on an item it will be sent to the database in the new format. Now you have some items in the new format and some in the old, this is badness, you don't want to be doing this.
Have fun with it.
K.