Like LIA's FAQ (link in post #2), I don't think submitting them with every report is a safe practice, but submitting them to clients is sometimes a requirement if they are to stay a client.
Check with your own E&O provider, make them explain any policy they have regarding the issue. I doubt very much that providing the info to a client will void or nullify your coverage - LIA plainly states in the link above that it does not affect the insured's coverage. They simply recommend that you send the data directly to the client and not to make it a part of any appraisal report. I've never included an E&O declarations page within an appraisal, just like I would never submit a copy of my license in an appraisal. Send them separately and directly to the client? Sure, no problem. But our appraisals never stop at the lender - they're passed around like candy after closing, by homeowners (and I've seen builders with appraisal collections, and even some Realtors). Bottom line is: End-use consumers (outside of those that directly engage us) have no need for our credentials, so only send them to the actual lender/lawyer/whomever clients, and send them outside of an appraisal report(s), as a separate fax or email attachment.
Also note: A more concerning issue is the verbiage in the AMC "contracts" that most of them have you sign is the ubigitous "indemnification and hold harmless" clauses. When you sign one of those, you're taking on the bulk of the actual AMC's liability. Then read your E&O policy, closely, and you'll find out that they only cover YOU, not an AMC. If that AMC later has a problem with one of your appraisals, they'll sue you for their legal fees and damages, and your E&O provider will then kindly remind you that you are NOT covered for those possible judgements.
The AMC Regulation Bill that recently passed here in NC specifically outlaws (as a prohibited act) AMCs forcing appraisers to sign such indemnity and hold harmless clauses. I know they're out there. The last 5 AMCs (aside from Kirchmeyer) that tried to recruit me all had such clauses in their "contracts" and is one of the numerous reasons I politely told them to take a hike. What good is having E&O insurance if it isn't going to cover a single AMC appraisal? For more info on this, I think LIA (link above, again) has a good outline of it in one of their FAQs. They obviously recommend against signing any "contracts" with such clauses in them, in no uncertain terms, as they also add in the perfunctory CYA - "it's a business decision" for each appraiser.