Texhnolyze is great, but you should be prepared to be depressed for a while after you watched it.
When I first tried Lain, I watched the first three episodes and didn't like the series and gave up on it. Later, I watched it again, only this time I fell in love with the series.
Seems like much of the Lain staff is working on Despera. I thought it was set to be released late 2009, but since I can't find an actual date, I'm guessing that it's more likely to be released in early 2010.