Apologies for not posting these sooner - here are the write-ups
for the last month and half of Architecture Chats.

• Word & Excel document generation - testing approaches,
  the problems with verifying document structure without styling,
  interop performance bottlenecks etc.
  
• Metadata, n-triples &
  semantic
  web.
  
• Supporting micro formats, formats that aren't formats etc.
  
• Symantec SVS.
  
• Software Engineering degrees vs. Comp Sci degrees, comparing
  volumes of practical experience, projects etc.
  
• NDA's & Student projects and the risks involved with
  offering projects to students vs. protecting IP / perceived
  business advantages.
  
• NUnit 2.5 details.
  
• Winforms to WPF -
  talking about why such a thing exists, the obvious risks and
  potential messes such a tool can create if not taken as just a
  learning tool.
  
• Longevity of purpose built languages vs. general purpose
  languages.
  
• ExtJS - I've talked about
  this JavaScript library a few times, but I don't think I've
  ever linked to it - so go check out the samples if you
  haven't.  Great fit for MVC based RIA's.
  
• Making code changes on site - advantages, disadvantages - and
  the relationship/perceptions it creates with customers (customers
  are either impressed, or begin to feel you can fix anything given a couple of
  hours).
  
• Observing customers on site using your software, difficulties
  in doing this without being onsite, ways to automate this etc.
  
• Entity Framework - ESQL.
  
• NHibernate HQL
  AST
  
• Visualising Linq queries, current options, what's missing
  etc.
  
• Flagging builds which are released to customers vs. builds
  which are released internally, and different approaches to
  versioning etc.
  
• Domainz hacked, msn redirected. 
  
• Sql injection attacks still working far too often.
  
• Nokia 1100 - huge demand, changing numbers, banking scams.
  
• Scaling and implementing document &
  distributed/persistent hash tables... including talking about
  CouchDB, MyISAM and Esent (Extensible Storage Engine).
  
• Lucene.Net -
  using/abusing it for storing your data along with search
  documents, and performance implications (i.e. the observation
  that it's still quick).