Did anyone worked with Self signed certificates for outbound and not from the list?

When performing callouts from Salesforce over HTTPS, it is required that the remote server have an SSL certificate signed by a root certification authority (CA) trusted by the default keystore in Sun's JDK 6 and approved by Salesforce. A complete list is found here:http://wiki.developerforce.com/index.php/Outbound_Messaging_SSL_CA_Certificates.

While working with self signed, i am getting the following error:
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

We have a visualforce page which displays the attachment records related
to an object.

It Displays the File Name, File type, Size and others.
Here the file name Field is a Link which renders a standard "Attached File"
page from where we can view the information of the file and in
that we have a "View File" link under Size field of the file.

Here the standard functionality is, If we click on that "View File"
link, it will open the attachment in Read only mode or you can save the file
to the local machine.

Can we open that file in "Edit mode" i.e after opening the file just edit the file and save the file it should directly get saved back to the attchment without using any external button.

I am very thankful if any one have some solution for this.

Thanks in advance.

How many times a trigger will be executed when try to insert 1000 records to a standard object like Accounts. How to test this? Thank you very much in advance.

We have a visualforce page which displays the attachment records related
to an object.

It Displays the File Name, File type, Size and others.
Here the file name Field is a Link which renders a standard "Attached File"
page from where we can view the information of the file and in
that we have a "View File" link under Size field of the file.

Here the standard functionality is, If we click on that "View File"
link, it will open the attachment in Read only mode or you can save the file
to the local machine.

Can we open that file in "Edit mode" i.e after opening the file just edit the file and save the file it should directly get saved back to the attchment without using any external button.

I am very thankful if any one have some solution for this.

Thanks in advance.