Jeff- In terms of complementarity with this site, stockcharts.com would be your best choice since the chart links (and pictures) used for the BPT newsletters, updates, and market lab are to stockcharts.com charts, as well as the vast majority of chart links posted by contributors to this message board.  Without a stockcharts.com subscription, you won't be able to see any of the intraday or monthly charts links (they will automatically revert to daily charts), nor all of the indicators for some of the daily and weekly charts.

I'm probably the most well read person here when it comes to trading books, at least of the regular posters, a field of study which includes technical analysis, of course.  The best book on technical analysis for you would depend on your level of interest and current level of knowledge on the subject, as well as your academic inclination, among other things perhaps.  If what you want is a serious, fairly comprehensive study of the subject, the following three books are probably the most prominent that fall into that category:   Technical Analysis of the Financial Markets, by John Murphy; Technical Analysis Explained, by Martin Pring; Technical Analysis of Stock Trends, by Edwards and Magee.  I've listed them in order from easiest to read but least in depth through most in depth but least easy to read.  The last one is often considered the "Bible" of technical analysis, but I think it is best used as a reference book rather than as one to read through from cover to cover in order to familiarize yourself with the subject. 

The most thorough treatment of particular aspects of technical analysis, of course, are not contained in comprehensive books, but in ones devoted to particular technical analysis subjects.  If your interest is in a recommendation for a book to study a particular subject within technical analysis, for example chart patterns, technical indicators, candlesticks, point and figure charting, etc. let me know, I could probably help you out.  Also, if you want to engage in a serious study of trading, keep in mind that it would involve other areas of study too in addition to technical analysis.  If you would prefer to read a more comprehensive, serious book on trading subjects which provides a good deal of attention to technical analysis but covers other aspects of trading as well, I would recommend either Trading for a Livingor Come Into My Trading Room, both of which are by Dr. Alexander Elder.  Traderslibrary.com is a good place to purchase trading books at discount.