[Andreas]

@ventrix
This is morless just templates and should have been asked over at www.vbulletintemplates.com
Nevertheless i'll answer you here.
Edit template memberlist and add the column where you want it to appear:

<td class="thead">header for your column</td>

Edit template memberlist_resultsbit and add a cell at the correct place:

<if condition="$userinfo[fieldx] AND exec_switch_bg()">
<td class="$bgclass">some foobar text or code $userinfo[fieldx]</td>
<else />
<td class="$bgclass">&nbsp;</td>
</if>

Where fieldx must be replaced by the actual field name of course
Don't fortget to set this field NOT to be display on memberlist, otherwise it will be duplicatedd (without the additional code)

@digitalSite
In user field manager (ACP) you can specify if a custom field should be display on memberlist or not.