Hi,
Gadgets?! :)
What you need to is actually perform two imports. The first will be an import of accounts, and the second will be an import of notes against the accounts. The notes import will contain your conversation details.
1) First download the templates you need for account and notes using the Data Management download template function in CRM. (Settings->Data Management -> Templates for Data Import)
You will need to add a 'Regarding' column to the Note template.
2) First you need to get a list of unique accounts - you can do this simply be extracting the account name column and using the Excel -> Remove duplicates command (on the Data tab). You need to ensure that you've done any reconcillation of data that is different between the multiple versions of the same account (other than the conversation field) - since this function will take the first row as the 'master'
3) Paste these accounts in your account template and import
4) Now take the conversation column and the corresponding account name field and paste it into the note template. The Account name goes in the 'Regarding' field and the conversation details goes in the 'Description' field. You can prepopulate the subject field with something like 'Conversation' - or may be the date.
Once you've imported the Accounts then the Notes, you'll have a nice conversation in the 'Notes' subgrid on the Account form.
Would that work for you?