Recent shower calculations
D.J. Asher
Proc. Int. Meteor Conf., Porec 2009, ed. Z. Andreic & J. Kac, IMO, 7-13 (2010)

Meteor shower predictions are now achieving considerable levels of success. Recent examples included the activity peaks in the 2009 Perseids and Leonids providing good matches to forecasts made by various meteor astronomers. It can also be shown, from orbit geometry calculations combined with knowledge of meteoroid ejection processes from cometary nuclei, that young dust trails in different streams have differently shaped cross sections, and therefore different outburst activity profiles when the Earth encounters them. Whereas Leonid trails have somewhat elliptical cross sections in the ecliptic plane, Perseid trail cross sections resemble - to those with sufficient imagination - the shape of legendary forest creatures.

Full Paper - PDF