Part of Pearson's online companion to textbooks -- you can get the online part for $35/year even without the textbook:
http://www.masteringbio.com/
Chemistry recommendation for people who are taking biology without having had all the chemistry yet:
http://www.amazon.com/Introduction-Chemistry-Biology-Students-9th/dp/0805395717/
Senior Biology 1 and 2 -- a supplement for AP biology.
http://www.biozone.co.nz/Review/SB/SB-02-1.php
http://www.thebiozone.com/international.php
Online supplemental biology labs:
http://www.biologylabsonline.com/index.html
Teaching Company course, Biology:The Science of Life
http://www.teach12.com/ttcx/CourseDescLong2.aspx?cid=1500
Compilation of High School Biology Links
http://sites.google.com/site/llapbiology/links
Singapore's Biology Matters (for "O" levels in Singapore) -- with workbooks, etc.
http://www.singaporemath.com/Biology_Matters_Textbook_9_10_gr_p/matbiotb.htm
Might be worth looking into more -- has practical (expts), workbook and text. They also have Chemistry for Gr 9/10.
