After looking at it briefly, it might just be my template chunk but I’ll look at it a little more in-depth tonight to make sure.
What’s causing it to fail validation?
I think so too
I think that eForm tends to output what you put into it.
I was trying the template chunk examples in the documentation so there might just be something invalid in the markup in the example. I was wondering why there werent any questions about W3 validation in this forum
Technically its the reccomended way to go since Transitional was made for temporary usage anyways but I believe it does have some effect on how browsers render pages (standards mode vs. quirks mode for example) Transitional also allows for certain tags that are deemed presentational (which should optimally be kept in an external stylesheet of some kind)
Since it’s tangentially related here, what’s the advantage of a XHTML Strict Doctype over an XHTML Transitional one? I stick with Transitional so I don’t have to use Javascript just to target new windows for links. Other than that, my Transitional documents would validate as strict...

<p><span style="color:#900;"></span></p>
<form method="post" action="contact">
<input type="hidden" name="formid" value="feedbackForm" />
<p><label accesskey="n" for="Name">Your Name</label>
<input type="text" name="Name" maxlength="60" /></p>
<p><label accesskey="e" for="email">Your Email Address</label>
<input type="text" name="email" size="40" maxlength="40" /></p>
<p><label accesskey="s" for="department">Subject</label>
<select name="department">
<option value="1">Web design enquiry</option>
<option value="2">Site feedback</option>
<option value="3">Miscellaneous</option>
</select></p>
<p><label accesskey="c" for="comments">Comments</label>
<textarea cols="40" rows="10" name="comments" ></textarea></p>
<p>
Please enter the anti spam code below:<br />
<img src="/manager/includes/veriword.php?rand=852011445" alt="verification code" border="1"/>
</p>
<p>
<label accesskey="c" for="vericode">code</label>
<input type="text" name="vericode" size="20" />
</p>
<p><input type="submit" name="submit" value="Send Feedback"></p>
</form><p><span style="color:#900;"></span></p>
<form method="post" action="contact">
<input type="hidden" name="formid" value="feedbackForm" />
<p><label accesskey="n" for="Name">Your Name</label>
<input type="text" name="Name" maxlength="60" /></p>
<p><label accesskey="e" for="email">Your Email Address</label>
<input type="text" name="email" size="40" maxlength="40" /></p>
<p><label accesskey="s" for="department">Subject</label>
<select name="department">
<option value="1">Web design inquiry</option>
<option value="2">Site feedback</option>
<option value="3">Miscellaneous</option>
</select></p>
<p><label accesskey="c" for="comments">Comments</label>
<textarea cols="40" rows="10" name="comments" ></textarea></p>
<p>
Please enter the anti spam code below:<br />
<img src="/manager/includes/veriword.php?rand=852011445" alt="verification code" border="1"/>
</p>
<p>
<label accesskey="c" for="vericode">code</label>
<input type="text" name="vericode" size="20" />
</p>
<p><input type="submit" name="submit" value="Send Feedback"></input></p>
</form>