Sharepoint MOSS 2007 distribute announcement over several site collections

The following lines of code iterate over all site collections within a Sharepoint / MOSS 2007 Farm and it's adding an announcement to each site collection.

To use this code i had to impersonate the user to the application pool user. This is the only user which allows me to access all content databases.

// connect to sharepoint and read all site collections under "default web site"
            foreach (var application in SPWebService.ContentService.WebApplications)
            {
                siteCollectionMax = application.Sites.Count;

                this.UpdateProcess(string.Format("Connecting to: {0}", application.Name));
                this.UpdateProcess(string.Format("Total Amount of #{0} site collections", siteCollectionMax));

                this.UpdateProcess("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");

                string currentUrl = string.Empty;
                this.UpdateProcess(
                    "Connecting to Sharepoint this can take some seconds!"
                );
                System.Threading.Thread.Sleep(500);

                foreach (SPSite site in application.Sites)
                {
                    try
                    {
                        currentUrl = site.Url;
                        siteCollectionCounter++;

                        using (SPSite s = new SPSite(site.Url))
                        {

                            using (SPWeb web = s.OpenWeb())
                            {
                                SPList list = web.GetList(s.Url + "/Lists/Announcements");
                                if (list != null)
                                {
                                    SPListItemCollection items = list.Items;
                                    SPListItem item = items.Add();
                                    item["Title"] = title.Trim();
                                    item["Body"] = body.Trim();
                                    item["Expires"] = expiries;
                                    item.Update();
                                    this.UpdateProcess(
                                        string.Format("#{0} of {1} - Announcement added to 'Site Collection': {2}", siteCollectionCounter.ToString(), siteCollectionMax.ToString(), currentUrl)
                                    );
                                }
                                else
                                {
                                    string txt = string.Format("Following 'Site Collection' does not contain an Announcement List: {0}", currentUrl);
                                    this.UpdateProcess(
                                        txt
                                    );
                                    errors.Add(txt);
                                }
                            }
                        }
                        System.Threading.Thread.Sleep(250);
                    }
                    catch (Exception ex)
                    {
                        this.UpdateProcess(
                                string.Format("An error occured: {0}", ex.Message)
                            );
                    }
                }
            }

The this.UpdateProcess(...) method is a helper method which writes into a log file. You can simply replace it and write to the Console.