A few good things coming this way soon...

Water-relations
Duncan Smith’s 'conductR' code is great for measuring hydraulic conductivity with either a balance or a pipette (in the field). 
[R] package 'fitplc' fitting sigmoidal/weibull functions to percent loss of conductivity data.
Anna Jacobsen's instructional powerpoint slides for various techniques including: Single vessel air-injection, hydraulic conductivity (Sperry apparatus), flushing, centrifuge method for vulnerability, and functional anatomy (vessel length, staining methods etc.)  
Optical Vulnerability Method (OVM) developed by Tom Brodribb, Chris Lucani, and Philippe Marmottant . Theory and apparatus construction: http://www.opensourceov.org/

Gas-exchange
xyz

Traitspace modelling
xyz

Species distribution modelling
http://rspatial.org/sdm/
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General 'ecophys' resources

​Prometheus wiki
Standardized handbook for measuring functional traits paper