Links:

Numa and Egeria [good stuff!!]: http://www.bartleby.com/196/23.html
Same this, different page: http://www.sacred-texts.com/pag/frazer/gb01301.htm

A tad about Egeria in relation to Numa: http://www.geocities.com/Athens/Forum/6946/numa.html
    These are the notes that are important [the second is of particular note]:
    "- Water nymph Egeria aided him in his religious reforms"
    "- At his death, Ovid says Egeria flew to Aricia to grieve for the king, and there was rebuked by Hippolytus for disturbing the rites of Diana with her lamentations"

Numa's religious changes: http://www.themystica.com/mystica/articles/n/numa_pompilius.html

An illuminated text is found to be about Numa and Egeria [picture!]: http://www.mnemosyne.org/mn_bits_apollo.html
    click on "Apollo?" for the picture of what is most likely Numa and Egeria

Interesting couple little stories involving Egeria [search the page for the name]: http://theosophy.org/tlodocs/teachers/Numa.htm

Similar recounting of one of these stories: http://classics.mit.edu/Plutarch/numa_pom.html

Blurb on Numa Pompilius [said to be pronounced noom pompils]: http://www.encyclopedia.com/articlesnew/34149.html

Short blurb on the myth: http://www.site-street.com/members/helenab9/mythology.html#egeria

A little blurb on Numa and his "hydromancy": http://www.ccel.org/fathers/NPNF1-02/Augustine/cog/t40.htm

http://www.bartleby.com/181/225.html

Very interesting description of a fountain named after Egeria.  Might try to fnid photos of it: http://www.mikecampbell.net/publicgardens.htm
 

http://home.swipnet.se/~w-48250/mythology/e/egeria.html

Interesting info that Egeria was entirely a myth made up by Numa: http://ancienthistory.about.com/library/bl/bl_livycal.htm
    No other info that I have backs this up, however

Includes a couple interesting poems about her: http://www.bulfinch.org/fables/bull22.html
    Byron, in "Childe Harold," Canto IV., thus alludes to Egeria and her grotto:

          "Here didst thou dwell, in this enchanted cover,
          Egeria! all thy heavenly bosom beating
          For the far footsteps of thy mortal lover;
          The purple midnight veiled that mystic meeting
          With her most starry canopy;" etc.

     Tennyson, also, in his "Palace of Art," gives us a glimpse of the royal lover expecting the interview:

          "Holding one hand against his ear,
          To list a footfall ere he saw
          The wood-nymph, stayed the Tuscan king to hear
          Of wisdom and of law."

This has a lovely painting of water nymphs: http://www.belinus.co.uk/mythology/Fnymphs.htm
 
 

http://academic.brooklyn.cuny.edu/classic/cbarnes/class0.1/opiate.htm
            a. Numa claimed to meet with a goddess by night, Egeria
                    i. told what rites the gods approved
                    ii. which priests were to do which duty
 

http://home.swipnet.se/~w-48250/mythology/e/egeria.html
 

Discussion of the fountain that Egeria and Numa were said to have met:
http://www.underome.com/sub/egeria2.html

Another photo of the Egeria fountain: http://www.romeartlover.it/Vasi59b.htm#Ninfeo di Egeria

Mirriam-Webster definition [enter "Egeria", also includes pronunciation]: http://m-w.com

Another dictionary definition: http://www.bartleby.com/65/eg/Egeria.html
 
 

Other references to Egeria, not related:

An aquatic plant: http://aquat1.ifas.ufl.edu/mcplnt1k.html

A German bathrobe company:  http://www.egeria.de/

A minor planet: http://cfa-www.harvard.edu/iau/Ephemerides/Bright/2001/00013.html