1. Back to Basics: Meta Descriptions 101 - Search Engine Journal
If you haven’t looked at your meta descriptions in over a year or 6 months, it may be time to refresh your meta data. Meta descriptions are the ones that will show up in search results, so they should sound coherent to humans. Read this refresher on meta tags.
2. Thinking about adding 10,000 pages to your site at once? Take caution. - Search Engine Land
If you are adding a large number of pages to your site, it is better to do so in stages according to Google’s Matt Cutts. Adding them in batches may be better. Releasing thousands of pages at once may cause Google to manually review your site for any suspicious behavior.